Caterpillar Cat 311B EXCAVATOR (Prefix 9MR) Service Repair Manual (9MR00001 and up)

1
Service Repair Manual
Models 311B EXCAVATOR
2
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Product EXCAVATOR Model 311B EXCAVATOR
9MR Configuration 311B TRACK-TYPE EXCAVATOR
9MR00001-UP (MACHINE) POWERED BY 3064 ENGINE
Disassembly and Assembly 311B, 312B 312B L
EXCAVATORS MACHINE SYSTEMS Media Number
-SENR9235-01 Publication Date -01/05/2003
Date Updated -14/06/2016
SENR92350024
Swing Drive SMCS - 4559-010 5459-017 Remove
Install Swing Drive

• Start By
• a. remove swing motor
• Fluid Spillage Containment
• Care must be taken to ensure that the fluids are
  contained during performance of the inspection,
  the maintenance, the testing, the adjusting and
  the repair of the machine. Be prepared to collect
  the fluid with suitable containers before opening
  any compartment or disassembling of the any
  components containing fluids. Refer to the "Tools
  And Shop Products Guide", NENG2500 for the tools
  and the supplies suitable to collect and contain
  any of the fluids in Caterpillar machines.
• Dispose of the fluids according to local
  regulations and mandates.
• Thoroughly clean around the mounting area of the
  swing drive prior to removal.
• Drain the oil from the swing drive into a
  suitable container. The capacity of the swing
  drive is
• 2.8 liters (.7 U.S. gal).

3

• Remove 12 bolts (2) and the washers that hold
  swing drive (1) in position.
• Fasten Tooling (A) and a hoist to the swing drive
  as shown.
• Remove swing drive (1) from the machine. The
  weight of the swing drive is 98 kg (215 lb).
  NOTE The following steps are for the
  installation of the swing drive.
• Thoroughly clean the mating surface of the main
  frame and swing drive housing.
• Put 5P-3931 Anti-Seize Compound on location pin
  (3) in the main frame.
• Put 1U-8846 Gasket Maker on the mating surface of
  the main frame and swing drive housing.
• NOTE During the installation, the locating pin
  for the swing drive may come out of the swing
  drive housing.
• Fasten Tooling (A) and a hoist to swing drive
  (1). Put the swing drive in its original position
  on the main frame. If locating pin (3) comes out
  of the swing drive housing, it can be reinstalled
  with a hammer after the swing drive is in place.
• Put 9S-3263 Thread Lock on the threads of 12
  bolts (2). Install the 12 bolts and the washers
  that hold the swing drive in place.
• NOTE Refer to the topic "Lubricant Viscosities
  and Refill Capacities" in the "Operation
  Maintenance Manual" for the proper filling
  procedure and the proper levels for the hydraulic
  oil system and swing drive.
• After the installation of the swing motor, fill
  the hydraulic oil tank and the swing drive with
  oil to the correct levels.
• End By
• a. install swing motor

Disassemble Assemble Swing Drive
4
Start By a. remove swing drive

1. Install the swing drive on a suitable stand.
2. Remove sun gear (1) from the swing drive.

3. Remove carrier assembly (2) from the ring gear.
5

1. Disassemble carrier assembly (2). Drive spring
   pin (3) into planetary shaft (4) with a hammer
   and a punch.
2. Remove planetary shaft (4), two thrust washers
   (5), and planetary gear (7) from the carrier.
   Remove bearing (6) from the planetary gear.
   Remove spring pin (3) from planetary shaft (4)
   with a hammer and a punch.
3. Remove the other two planetary gears from the
   carrier as in Steps 4 and 5.

7. Remove sun gear (8) from the carrier.
8. Remove snap ring (9) from sun gear (8).
6
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7
9. Remove O-ring seal (10). Remove ring gear (11)
from the swing housing.
10. Remove bolt (12) from the end of the pinion
shaft.
11. Put the swing housing and the pinion shaft on
its side as shown. Put an alignment mark on the
cage and swing housing for assembly purposes.
Remove eight bolts (13) and the washers that hold
the cage with the pinion shaft to the swing
housing.
NOTICE To prevent damage to the pinion shaft
during the removal with a press, put wood blocks
under components.
8
12. Put the swing casing and the pinion shaft in
a press as shown. Put wood blocks under the
pinion shaft. Press the pinion shaft and the cage
out of the swing housing as a unit. Remove
carrier assembly (14). Remove the O-ring seal
from the swing housing.
13. Remove retainer (15) from carrier assembly
(14).

1. Remove bearing (16) from carrier assembly (14).
2. Disassemble carrier assembly (14). Drive spring
   pin (17) into planetary shaft (18) with a hammer
   and a punch.
3. Remove planetary shaft (18), two thrust washers
   (20), and planetary gear (19) from the carrier.
   Remove bearing (21) from the planetary gear.
   Remove spring pin (17) from planetary shaft (18)
   with a hammer and a punch.
4. Remove the other two planetary gears from the
   carrier as in Steps 15 and 16.

18. Remove spacer (22) from the pinion shaft by
hand.
9
19. Remove shim (23) from the pinion shaft.
20. Remove pinion shaft (26) from bearing (24)
and cage (25) with a press as shown. If
necessary, remove the oil seal from the cage.

• If necessary, remove two bearing races (27) from
  the swing housing. Remove drain pipe (28).
• NOTE The following steps are for the assembly of
  the swing drive.
• Make sure all of the parts of the swing drive are
  thoroughly clean and free of dirt and debris
  prior to assembly.

23. If removed, install two bearing races (27) in
the swing housing. Install drain pipe (28).
NOTE Do not install the oil seal in cage (25) at
this time. 24. Install cage (25) and bearing (24)
on pinion shaft (26). Put spacer (23) over the
pinion shaft.
10

• Install spacer (22) over the pinion shaft.
• Make sure the mating surfaces of the cage and the
  swing housing are clean and free of dirt and
  debris. Put a bead of 1U-8846 Gasket Maker on the
  mating surface of the cage. Install the cage with
  the pinion shaft in the swing housing. Make sure
  the alignment marks made on each component during
  disassembly line up with each other. Install
  bolts (13) and the washers that hold the cage and
  pinion shaft to the swing housing. Tighten the
  bolts to a torque of 33 3.5 Nm (24 2 lb ft).
• Put a thin coat of clean SAE 30 weight oil on
  bearing (16). Install bearing (16) in the swing
  housing with a plastic hammer. Make sure the
  bearing is seated against the counterbore in the
  swing casing.
• Assemble carrier assembly (14).
• Put clean SAE 30 weight oil on bearing (21).
• Install bearing (21) in planetary gear (19).
• Install a thrust washer (20) on each side of the
  planetary gear.
• Install the planetary gear and the thrust washers
  in the carrier.
• Install planetary shaft (18) in carrier (14) and
  through planetary gear (19).
• Make sure the spring pin hole in the planetary
  shaft is in alignment with the spring pin hole in
  the carrier.
• Install spring pin (17) in the carrier and into
  the planetary shaft.
• Install the spring pin until it is 2 to 3 mm
  (.078 to .118 in) below the outside surface of
  the carrier, and with the split in the spring pin
  facing toward the top or the bottom of the
  carrier. To prevent the spring pin from falling
  out, make a stake mark on each side of the spring
  pin hole in the carriage. Each stake mark should
  be approximately 1.5 mm (.10 in) from the spring
  pin hole.
• Install the remaining planetary gears in carrier
  (14) as in Step 28.
• Install retainer (15) to carrier (14).
• Use two persons to install carrier assembly (14)
  over the end of the pinion shaft. Make sure the
  carrier assembly is completely seated. It may be
  necessary to use a press to seat the carrier
  assembly.

• Install bolt (12) to the pinion shaft. Tighten
  the bolt to a torque of 314 20 Nm (230 15 lb
  ft).
• Using bolt (12) check the bearing rolling torque.
  The bearing rolling torque should be 3.14
• 1.26 Nm (2 1 lb ft). If the bearing rolling
  torque is not within specification, spacers (22)
  and/or
• (23) need to be changed. Refer to the
  Specifications for 311B, 312B and 312B L
  Excavators, Hydraulic Systems for spacer part
  numbers and thicknesses.

11

• When the proper bearing rolling torque is reached
  the following needs to be done.
• Disassemble the swing drive, and install the oil
  seal in cage (25). Put a thin coat of 5P-0960
  Multipurpose Grease on the sealing lip.
• Reassemble the swing drive. Follow steps 23 thru
  32.
• Apply 9S-3263 Thread Lock on the threads of bolts
  (13). Tighten the bolts to a torque of 33
• 3.5 Nm (24 2 lb ft).
• Apply 9S-3263 Thread Lock on the threads of bolts
  (12). Tighten the bolts to a torque of 314
• 20 Nm (230 15 lb ft).
• Install the O-ring seal on the swing housing.

• Install ring gear (11) in its original position
  on the swing housing. Put O-ring seal (10) on the
  ring gear.
• Install snap ring (9) on sun gear (8).
• Assemble carrier assembly (2).
• Put clean SAE 30 weight oil on bearing (6).
• Install bearing (6) in planetary gear (7).
• Install a thrust washer (5) on each side of the
  planetary gear.
• Install the planetary gear and the thrust washers
  in carrier (2).
• Install planetary shaft (4) in carrier (2) and
  through planetary gear (7).
• Make sure the spring pin hole in the planetary
  shaft (4) is in alignment with the spring pin
  hole in the carrier.
• Install spring pin (3) in the carrier and into
  the planetary shaft.
• Install the spring pin until it is 2 to 3 mm
  (.078 to .118 in) below the outside surface of
  the carrier, and with the split in the spring pin
  facing toward the top or bottom of the carrier.
• To prevent the spring pin from falling out, make
  a stake mark on each side of the spring
• pin hole in the carrier.
• Each stake mark should be approximately 1.5 mm
  (.10 in) from the spring pin hole.
• Install the other two planetary gears in carrier
  (2) as in Step 42.
• Use two persons to install carrier assembly (2)
  in the ring gear. Make sure the carrier assembly
  is not tilted after installation.
• Install sun gear (1) in carrier assembly (2).
• NOTE Refer to the topic "Lubricant Viscosities
  and Refill Capacities" in the "Operation
  Maintenance Manual" for the proper filling
  procedure and the proper levels for the swing
  drive.

12
46. Fill the swing drive with clean oil prior to
installation of the swing motor. End By a.
install swing drive
Copyright 1993 - 2020 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Thu Dec 3 091235 UTC0800 2020
13
Shutdown SIS
Previous Screen
Product EXCAVATOR Model 311B EXCAVATOR
9MR Configuration 311B TRACK-TYPE EXCAVATOR
9MR00001-UP (MACHINE) POWERED BY 3064 ENGINE
Disassembly and Assembly 311B, 312B 312B L
EXCAVATORS MACHINE SYSTEMS Media Number
-SENR9235-01 Publication Date -01/05/2003
Date Updated -14/06/2016
SENR92350025
Undercarriage Frame Assembly SMCS -
4150-010 Remove Install Undercarriage Frame
Assembly
Start By a. remove bucket Fluid Spillage
Containment Care must be taken to ensure that the
fluids are contained during performance of the
inspection, the maintenance, the testing, the
adjusting and the repair of the machine. Be
prepared to collect the fluid with suitable
containers before opening any compartment or
disassembling of the any components containing
fluids. Refer to the "Tools And Shop Products
Guide", NENG2500 for the
14
tools and the supplies suitable to collect and
contain any of the fluids in Caterpillar
machines. Dispose of the fluids according to
local regulations and mandates.
1. Position the machine on a level surface.
Dimension "X" is equal to 907 mm (36 in).

1. Position drain plug (1) for each final drive in
   the position shown. Drain the oil from each final
   drive into a suitable container. The capacity of
   each final drive is 2.5 to 2.6 liters (.6 to .7
   U.S. gal).
2. Remove bolts (2) and cover (3) from each final
   drive.

When sun gear (4) is removed from each final
drive, the brakes for the machine are inoperable.
The machine is free to move. To prevent movement
of the machine, put wood blocks in front of and
behind each track assembly.
15

1. Remove sun gear (4) from each final drive.
2. Temporarily reinstall cover (3) back on each
   final drive.

6. Loosen, but do not remove bolts (5) that hold
the undercarriage frame assembly to the upper
structure. Swing the upper structure to gain
access to all of the bolts.
7. Remove right hand boom cylinder (6) from the
machine. Refer to the topic "Remove Install
Boom Cylinders" in this module. Put caps in the
hydraulic lines that connect to the right hand
boom cylinder.
8. Start the machine. Raise the boom until the
center of the pin bore for the bucket-to-stick
pin joint is approximately 907 mm (36 in) off the
floor. NOTICE Do not lower the boom after
Tooling (A) has been installed in place of the
right hand boom cylinder.
9. Adjust the length of Tooling (A), and install
it in place of the right hand boom cylinder.
Install the five bolts, the washers and the nuts
to hold the link group together.
16
10. Install Tooling (B) under the stick as shown.
NOTICE Do not position Tooling (B) under the
counterweight of the machine. Position it only
under the main frame.
11. Install Tooling (B) under the main frame at
the rear of the machine as shown.
12. Remove four hose assemblies (7) from the
swivel joint.
13. Remove two hose assemblies (8) and (9) from
the swivel joint.
17

1. Remove locking bolt (11) from the swivel joint.
2. Loosen hose clamp (10).

1. Disconnect grease tube assembly (12) from the
   block on the frame of the upper structure.
2. Remove all bolts (5) that hold the upper
   structure to the undercarriage frame assembly.

During the removal, the upper structure must be
kept in a level position at all times.
18. Raise the upper structure off of the
undercarriage frame assembly with tooling (B) in
13 mm (.5 in) increments. Raise the upper
structure until it is above swivel joint group
(13). Adjust the height of Tooling (B) at the
same time to keep the upper structure level. The
weight of the upper structure is approximately
726 kg (16,000 lb). NOTE The boot on the swivel
joint group is very flexible. This will allow the
swivel joint to slide thru it as the upper
structure is being raised.
18

• Fasten a chain to the rear of the undercarriage
  frame assembly (14). Pull the undercarriage frame
  assembly out from under the upper structure with
  a lift truck. Check the clearance between the
  upper structure and the swivel joint during the
  removal procedure. The weight of the
  undercarriage frame assembly is approximately
  5000 kg (11,000 lb).
• NOTE The following steps are for the
  installation of the undercarriage frame assembly.
• Make sure the mating surfaces of the upper
  structure and undercarriage frame assembly are
  thoroughly clean and free of dirt and debris.

• Install two suitable size guide bolts (15) in the
  mounting bolt holes in the upper structure and
  the undercarriage frame assembly as shown.
  Install the guide bolts 180 degrees apart.
• Put a coat of 1U-8846 Gasket Maker on the mating
  surface of the swing gear and bearing of the
  undercarriage assembly. Put 5P-3931 Anti-Seize
  Compound in the locating dowel hole in the
  undercarriage frame assembly.
• Using a lift truck, move undercarriage frame
  assembly (14) in position under the upper
  structure. Block the undercarriage frame assembly
  so it can not move.
• NOTICE
• When the upper structure is installed, do not
  damage the tooth contact surfaces of the pinion
  shaft and the swing gear and bearing. Keep the
  upper structure level as it is being lowered into
  position.

1. Remove the pins from the tubes of Tooling (B).
   Lower the upper structure down in 13 mm (.15 in)
   increments with Tooling (B). Align the guide
   bolts in the upper structure with the bolt holes
   in the undercarriage frame assembly. Move the
   undercarriage frame assembly to obtain proper
   alignment.
2. As the upper structure is being lowered, check
   the alignment of the pinion shaft with the swing
   gear and bearing. Also, check the alignment of
   the dowel in the upper structure with the dowel
   hole in the swing gear and bearing.
3. Put a coat of 9S-3262 Thread Lock Component on
   the threads of all bolts (5) that hold the upper
   structure to the undercarriage frame assembly.
   Install all bolts (5) and tighten the bolts that
   are easily accessible to a torque of 270 40 Nm
   (200 30 lb ft).
4. Connect grease tube assembly (12) to the block on
   the front of the upper structure.

19

• Reinstall clamp (10) over swivel boot. Reinstall
  two hose fittings (8) and (9) in swivel joint
  group.
• Reinstall lock bolt (11) in the swivel group.
• Connect four hose assemblies (7).
• Remove Tooling (A) from the machine.
• NOTE Refer to the topic "Lubricant Viscosities
  and Refill Capacities" in the "Operation
  Maintenance Manual" for the proper filling
  procedure and the proper levels for the hydraulic
  oil system.
• Fill the hydraulic oil tank with oil to the
  correct level.
• Start the machine, and straighten it out.
• Reinstall right hand boom cylinder (6). Refer to
  the topic "Remove Install Boom Cylinders" in
  this module.
• Remove Tooling (B) from under the rear of the
  machine.
• Remove Tooling (B) from under the stick.
• Install the remainder of bolts (5). The machine
  can be rotated to the left or right to make
  access to all bolts (5) easier. Tighten the bolts
  to a torque of 270 40 Nm (200 30 lb ft).
• Remove cover (3) from each final drive.
• Install sun gear (4) in each final drive.
• Make sure the machined surface of the ring gear
  in the final drive and cover (3) is thoroughly
  clean, free of dirt and debris and is dry. Put a
  bead of 1U-8846 Gasket Maker around the machined
  surface of the ring gear. Put cover (3) in its
  original position on the ring gear.
• Put 9S-3263 Thread Lock on the threads of bolts
  (2) that hold cover (3) in position. Install
  bolts (2) and the washers that hold the cover.
  Tighten the bolts to a torque of 29 2 Nm (22
  2 lb ft).
• NOTE Refer to the topic "Lubricant Viscosities
  and Refill Capacities" in the "Operation
  Maintenance Manual" for the proper filling
  procedure and the proper levels for each of the
  hydraulic drives.
• Fill each final drive with oil to the correct
  level. End By
• a. install bucket

Copyright 1993 - 2020 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Thu Dec 3 091331 UTC0800 2020
20
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Previous Screen
Product EXCAVATOR Model 311B EXCAVATOR
9MR Configuration 311B TRACK-TYPE EXCAVATOR
9MR00001-UP (MACHINE) POWERED BY 3064 ENGINE
Disassembly and Assembly 311B, 312B 312B L
EXCAVATORS MACHINE SYSTEMS Media Number
-SENR9235-01 Publication Date -01/05/2003
Date Updated -14/06/2016
SENR92350026
Swing Gear Bearing SMCS - 7063-010 Remove
Install Swing Gear Bearing
Start By a. remove undercarriage frame assembly
21

1. Put an alignment marks on the swing gear and
   bearing and the undercarriage frame assembly for
   assembly purposes. Remove bolts (2) and the
   spacers that hold swing gear and bearing (1) to
   the undercarriage frame assembly.
2. Fasten Tooling (A) and a hoist to the swing gear
   and bearing as shown. The bolts and the spacers
   used to hold the upper structure to the
   undercarriage frame assembly can be used to
   install Tooling (A).
3. Remove the swing gear and bearing. The weight of
   the swing gear and bearing is 171 kg (376 lb).

• Typical Example
• Tape over the sealing surfaces of the dust seals,
  the inner race and the outer race. This will
  prevent cleaning solvent from entering the cross
  sections of the dust seals. Thoroughly clean the
  swing gear and bearing.
• Remove dust seals (3) and (4) from the outer and
  the inner races of the swing gear and bearing.
• Clean the sealing grooves of the inner and the
  outer races with fine grit sandpaper then use a
  cleaning solvent to clean the seal grooves. Make
  sure the seal grooves are thoroughly clean and
  dry prior to installing new dust seals.
• NOTE The following steps are for the
  installation of the swing gear and bearing.
• Lay a new dust seal (3) in the outer race to
  determine the required length. Cut the new seal
  approximately 1 cm (.4 in) shorter than the
  required length. Cut the seal at a 90 degree
  angle. Use a file to smoothen the cross section
  cut of the seal.
• Install new dust seal (3) in the outer race using
  8T-9021 Adhesive. Make sure to put adhesive on
  the 90 degree cross section of the seal. Install
  the seal with the lip facing as shown in
  Illustration C30014P1.
• Install a new dust seal (4) in the inner race.
  Follow the same procedure as in Steps 7 and 8.

22
10. Lubricate the swing gear and the bearing with
grease.

• Clean the mating surfaces for the swing gear and
  bearing on the undercarriage frame assembly. Put
  1U-8846 Gasket Maker on the mating surface.
  Fasten Tooling (A) and a hoist to swing gear and
  bearing (1), and put it in position on the
  undercarriage frame assembly. Make sure the stamp
  mark "S" on the inner race is positioned as
  shown, relative to the undercarriage frame
  assembly and the stopper on the outer race.
• Put a thin coat of 2P-2506 Thread Lubricant on
  the threads of bolts (2). Install the spacers and
  bolts (2) that hold the swing gear and bearing to
  the undercarriage frame assembly. Tighten the
  bolts to a torque of 270 40 Nm (200 30 lb
  ft). If desired, Tooling (B) can be used to
  tighten the bolts.
• End By

23
a. install undercarriage frame assembly
Copyright 1993 - 2020 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Thu Dec 3 091426 UTC0800 2020
24
Shutdown SIS
Previous Screen
Product EXCAVATOR Model 311B EXCAVATOR
9MR Configuration 311B TRACK-TYPE EXCAVATOR
9MR00001-UP (MACHINE) POWERED BY 3064 ENGINE
Disassembly and Assembly 311B, 312B 312B L
EXCAVATORS MACHINE SYSTEMS Media Number
-SENR9235-01 Publication Date -01/05/2003
Date Updated -14/06/2016
SENR92350027
Hydraulic Oil Tank SMCS - 5056-010 Remove
Install Hydraulic Oil Tank
Start By a. remove hydraulic oil filter
group Fluid Spillage Containment Care must be
taken to ensure that the fluids are contained
during performance of the inspection, the
maintenance, the testing, the adjusting and the
repair of the machine. Be prepared to collect the
fluid with suitable containers before opening any
compartment or disassembling of the any
components containing fluids. Refer to the "Tools
And Shop Products Guide", NENG2500 for the tools
and the supplies suitable to collect and contain
any of the fluids in Caterpillar
machines. Dispose of the fluids according to
local regulations and mandates.
At operating temperature, the hydraulic oil tank
is hot and under pressure. Hot oil can cause
burns. To prevent possible personal injury,
release the pressure in the implement hydraulic
circuits (the boom, the stick and the bucket)
before any of the hydraulic lines or any of the
components are disconnected or removed.
25

• Release the pressure in the implement hydraulic
  circuits (the boom, the stick and the bucket)
  before any of the hydraulic lines or any of the
  components are disconnected or removed. Release
  the pressure as follows
• Shut off the engine and place key in the "ON"
  position. Put the hydraulic activation control
  lever in the "UNLOCK" position.
• Move the control levers for the boom, the stick
  and the swing to all full stroke positions.
• This will release any pressure that might be
  present in the pilot system.
• Return the key to the "OFF" position.
• Slowly loosen the fill plug on the hydraulic
  tank, and release the pressure.
• Tighten the fill plug on the hydraulic tank.
• The pressure in the hydraulic system has been
  released, the lines and the components can be
  removed.
• Drain the oil from the hydraulic oil tank into a
  suitable container. The capacity of the hydraulic
  oil tank is 99 liters (26 U.S. gal).

3. Remove two bolts (1) and the washers that
secure plate (2). Remove plate (2).

1. Remove two bolts (3) that secure the governor
   motor control to support (5).
2. Remove three bolts (4) that secure support to the
   machine. Remove support (5).

6. Remove two bolts (6) and the washers that
secure cover (7) to the machine. Remove cover (7).
26
7. Remove bolts (8) and the washers that secure
side cover.
8. Remove three bolts (9) and the washers that
secure side cover (10). Remove side cover (10).

• View From Under Machine
• Remove two bolts (12), and loosen two bolts (11)
  that secure plate (13) to the frame. Remove cover
  (13).
• Open the left hand access door.

1. Remove two electrical connectors (14) from the
   side of the hydraulic oil tank.
2. Remove two hose assemblies (15) and (16) from the
   side of the hydraulic oil tank.

27
13. Loosen two hose clamps (17), and remove hose
(18) from the hydraulic oil tank.
14. Disconnect electrical connector (19). Remove
three wire ties (20) from the side of the
hydraulic oil tank.
15. Remove bolts (21) and the washers that
secures p-clamp (22) to the side of the hydraulic
oil tank.
View From Under Machine 16. Remove six bolts
(23) and the washers that secure that hydraulic
oil tank to the frame.
28
17. Attach Tooling (A) to the hydraulic oil tank
as shown. Using a suitable lifting device, remove
the hydraulic oil tank from the machine. The
weight of the hydraulic oil tank is 105 kg (231
lb). NOTE The following steps are for the
installation of the hydraulic oil tank.
18. Fasten Tooling (A) and a hoist to hydraulic
oil tank. Put the hydraulic oil tank in position
on the frame of the machine.
19. Install four bolts (23) and the spacers that
hold it in place. Tighten the four bolts to a
torque of 270 40 Nm (200 30 lb ft).
20. Install P-clamp (22) and bolt (21) that
secures it.
29
21. Connect electrical connector (19), and
install wire ties (20).
22. Install hose (18), tighten hose clamps (17).

1. Install two electrical connectors (14).
2. Install two hose assemblies (15) and (16).

25. Install plate (13). Install bolts (12), and
tighten bolts (11).
30
26. Install side cover (10) and three bolts (9).
27. Install bolt (8).
28. Install front cover (7) and two bolts (6)
that secure it.

1. Install support (5) and three bolts (4) that
   secure it.
2. Install two bolts (3) that secure the governor
   motor control to support (5).

31

• Install plate (2) and two bolts (1) that secure
  it.
• Make sure the drain plug for the hydraulic oil
  tank is tight. Tighten the drain plug to a torque
  of 68 7 Nm (50 5 lb ft).
• NOTE Refer to the topic "Lubricant Viscosities
  and Refill Capacities" in the "Operation
  Maintenance Manual" for the proper filling
  procedure and the proper levels for the hydraulic
  oil system.
• Fill the hydraulic oil tank with oil to the
  correct level. End By
• a. install hydraulic oil filter group

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Product EXCAVATOR Model 311B EXCAVATOR
9MR Configuration 311B TRACK-TYPE EXCAVATOR
9MR00001-UP (MACHINE) POWERED BY 3064 ENGINE
Disassembly and Assembly 311B, 312B 312B L
EXCAVATORS MACHINE SYSTEMS Media Number
-SENR9235-01 Publication Date -01/05/2003
Date Updated -14/06/2016
SENR92350028
Pilot Control Valves (Travel) SMCS - 5462-010
5462-017 Remove Install Pilot Control
Valves Fluid Spillage Containment Care must be
taken to ensure that the fluids are contained
during performance of the inspection, the
maintenance, the testing, the adjusting and the
repair of the machine. Be prepared to collect the
fluid with suitable containers before opening any
compartment or disassembling of the any
components containing fluids. Refer to the "Tools
And Shop Products Guide", NENG2500 for the tools
and the supplies suitable to collect and contain
any of the fluids in Caterpillar
machines. Dispose of the fluids according to
local regulations and mandates.
At operating temperature, the hydraulic oil tank
is hot and under pressure. Hot oil can cause
burns. To prevent possible personal injury,
release the pressure in the implement hydraulic
circuits (the boom, the stick and the bucket)
before any of the hydraulic lines or any of the
components are disconnected or removed.

• Release the pressure in the implement hydraulic
  circuits (the boom, the stick and the bucket)
  before any of the hydraulic lines or any of the
  components are disconnected or removed. Release
  the pressure as follows
• Shut off the engine and place key in the "ON"
  position. Put the hydraulic activation control
  lever in the "UNLOCK" position.
• Move the control levers for the boom, the stick
  and the swing to all full stroke positions.
• This will release any pressure that might be
  present in the pilot system.
• Return the key to the "OFF" position.

34

1. Slowly loosen the fill plug on the hydraulic
   tank, and release the pressure.
2. Tighten the fill plug on the hydraulic tank.
3. The pressure in the hydraulic system has been
   released, the lines and the components can be
   removed.

View From Under Cab 2. Remove seven bolts (1),
the washers that hold access cover (2) in place.
Remove the access cover from under the cab.

• View From Under Cab
• Put identification marks on four hose assemblies
  (3) that are connected to the pilot control valve
  (travel) so they can be reinstalled in their
  original locations. Disconnect the four hose
  assemblies from the valve. Put plugs in the hose
  assemblies to keep dirt and debris out of the
  hydraulic system.
• Disconnect spring assembly (4) from the pilot
  control valve (travel).

• Remove the rubber floor mat from the cab to gain
  access to the pilot control valve (travel).
• Remove two bolts (8) and the washers that hold
  pilot control valve (travel) (6) to the cab
  floor. Remove pilot control valve (travel).
• NOTE The following steps are for the
  installation of the pilot control valve (travel).

35

• 7. Put pilot control valve (travel) (6) in
  position in the cab floor. Install the two
  washers and bolts
• (5) that hold it. Reinstall the rubber floor mat
  in the cab.
• Connect spring assembly (4) and four hose
  assemblies (3) to the pilot control valve
  (travel).
• Reinstall access cover (2) under the cab.
• NOTE Refer to the topic "Lubricant Viscosities
  and Refill Capacities" in the "Operation
  Maintenance Manual" for the proper filling
  procedure and the proper levels for the hydraulic
  oil system.
• Check the oil level in the hydraulic oil tank.
  Fill the hydraulic oil tank with oil to the
  correct level.
• Disassemble Assemble Pilot Control Valves
  (Travel)
• Start By
• a. remove pilot control valves (travel)
• NOTICE
• Do not mix the components in the pilot control
  valve (travel) as it is being disassembled. All
  of the components should be reinstalled in their
  original locations. Put identification marks on
  all of the components to prevent mixing.

1. Make sure the outside of the pilot control
valve (travel) is thoroughly clean prior to
disassembly. Check the condition of all of the
O-ring seals used in the valve. If the O-ring
seals are worn or damaged, use new parts for
replacement.
36
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