Caterpillar Cat 621E WHEEL SCRAPER (Prefix 6BB) Service Repair Manual (6BB00001-01234)

1
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Product WHEEL SCRAPER Model 621E WHEEL SCRAPER
6BB Configuration 621E TRACTOR-SCRAPER / POWER
SHIFT / 6BB00001-01234 (MACHINE) POWERED BY 3406
ENGINE
Disassembly and Assembly 621E, 623E, 627E
TRACTORS POWER TRAIN Media Number
-SENR3303-01 Publication Date -01/02/1991
Date Updated -10/03/2010
SENR33030021
Transfer Gears SMCS - 3159-015
3159-016 Disassemble Transfer Gears

• Start By
• remove transfer gears OR
• separation of transfer gears from transmission

2
1. Remove bolts (1), and remove filter housing
(2). Remove the pumps (3). See the topic,
Transmission Oil Pump.
2. Remove the bolts that hold cage (4). Install
two 3/8" - 16 NC forcing screws (5), and remove
the cage, shims (6), and gear (7).
3. Remove the bolts that hold cage (8). Install
two 3/8" - 16 NC forcing screws (9), and remove
the cage, shims (10), and gear (11).
4. Remove bearing cups (12) and (13) from the
case assembly with a hammer and a punch.
3
5. Turn the transfer gear case over. Remove the
bolts that hold cage (15). Install two 3/8" - 16
NC forcing screws (14), and remove cage (15),
shims (16), and gear (17).
6. Remove bearing cup (18) from the case assembly
with a hammer and a punch.
7. Turn the transfer gear case over. Remove three
bolts (19). If required, install 3/8" - 16 NC
forcing screws in holes 180 from the bolt holes,
and remove gear (20).
8. Remove retaining ring (21).
4
9. Use a punch and a hammer to drive bearing (22)
and carrier (23) from gear (20).
10. Remove bearing (22) from carrier (23).

1. Remove six bolts (24), and remove gear (25) from
   gear (17). Remove bearing cone (26) from gear
   (17) with tooling (B).
2. Remove bearing cone (27) from gear (11) and
   bearing cone (28) from gear (7) with tooling (E).

• Remove bearing cup (29) from cage (8) with
  tooling (D). Remove O-ring seal (30) from the
  cage.
• Remove bearing cup (31) from cage (15) with a
  hammer and punch. Remove bearing cone
• (32) from cage (4) with tooling (C). Remove
  O-ring seal (33) from cage (4).

5
Assemble Transfer Gears
1. Install bearing (22) in carrier (23).
2. Install bearing (22) and carrier (23) on gear
(20) with a hammer and a punch. Install retaining
ring (21).
3. Install gear (20) in the transfer gear case,
and install bolts (19). Tighten the bolts to a
torque of 50 7 Nm (37 5 lb ft).
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4. Lower the temperature of bearing cups (29),
(31), and (32). Install bearing cups (29), (31),
and (32) with tooling (A). Make sure O-ring seals
(30) and (33) are in position on the cages.

• 5. Heat bearing cone (26) to a maximum
  temperature of 149 C (300 F) and install it on
  gear
• (17). Install gear (25) on gear (17) and bolts
  (24) that hold it. Tighten the bolts to a torque
  of 50 7 Nm (37 5 lb ft).
• Heat bearing cone (27) to a maximum temperature
  of 149 C (300 F) and install it on gear (11).
• Heat bearing cone (28) to a maximum temperature
  of 149 C (300 F) and install it on gear (7).

8. Turn the transfer gear case over. Lower the
temperature of bearing cup (18), and install it
with tooling (A).
8
9. Remove the forcing screws from the cage.
Install gear (17), shims (16), cage (15) and the
bolts that hold the cage.

1. Install tooling (F) and measure the end play in
   the gear with pry bar and blocks (34). Add or
   remove shims under the cage to get 0.15 0.05 mm
   (.006 .002 in.) end play in the gear.
2. Tighten the bolts that hold cage (15) to a torque
   of 50 7 Nm (37 5 lb ft).

12. Turn the transfer gear case over. Lower the
temperature of bearing cups (12) and (13), and
install them with tooling (A).
13. Remove the forcing screws from the cage.
Install gear (11), shims (10), cage (8) and the
bolts that hold the cage.
9

1. Install tooling (F), and measure the end play in
   the gear. Add or remove shims under the cage to
   get 0.15 0.05 mm (.006 .002 in.)) end play in
   the gear.
2. Tighten the bolts that hold cage (8) to a torque
   of 50 7 Nm (37 5 lb ft).

16. Remove the forcing screws from the cage.
Install gear (7), shims (6), cage (4) and the
bolts that hold the cage.
Typical Example 17. Install tooling (F), and
measure the end play in the gear. Add or remove
shims under the cage to get 0.15 0.05 mm (.006
.002 in) end play in the gear.
18. Position filter housing (2) and install bolts
(1) that hold it. Install pumps (3), see the
topic, Transmission Oil Pump.
Copyright 1993 - 2021 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Sat Apr 3 083547 UTC0800 2021
10
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Previous Screen
Product WHEEL SCRAPER Model 621E WHEEL SCRAPER
6BB Configuration 621E TRACTOR-SCRAPER / POWER
SHIFT / 6BB00001-01234 (MACHINE) POWERED BY 3406
ENGINE
Disassembly and Assembly 621E, 623E, 627E
TRACTORS POWER TRAIN Media Number
-SENR3303-01 Publication Date -01/02/1991
Date Updated -10/03/2010
SENR33030022
Transmission Control Box SMCS - 3168-010 Remove
And Install Transmission Control Box
1. Remove five bolts (1), and open door (2).
2. Disconnect wire harness (3) from the
transmission control box.
11

1. Remove four bolts (4), and remove transmission
   control box (5).
2. To install the transmission control box, position
   it and install bolts (4) that hold it.
3. Connect wire harness (3). Close door (2), and
   install bolts (1) that hold it in place.

Copyright 1993 - 2021 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Sat Apr 3 083643 UTC0800 2021
12
Shutdown SIS
Previous Screen
Product WHEEL SCRAPER Model 621E WHEEL SCRAPER
6BB Configuration 621E TRACTOR-SCRAPER / POWER
SHIFT / 6BB00001-01234 (MACHINE) POWERED BY 3406
ENGINE
Disassembly and Assembly 621E, 623E, 627E
TRACTORS POWER TRAIN Media Number
-SENR3303-01 Publication Date -01/02/1991
Date Updated -10/03/2010
SENR33030023
Transmission Oil Filter SMCS - 3067-010 Remove
And Install Transmission Oil Filter
1. Remove transmission oil filter (1) from
transfer gear housing after four bolts (3) are
removed. Remove bolts (2) from cover assembly.
2. Remove cover assembly (4) and filter element
(5) from filter housing.
13
3. Make a separation of the filter element (5)
from cover assembly (4) after nut (7) is removed.
Remove and inspect O-ring seal (6). Make a
replacement if necessary.

• Remove plug and seal (10) from filter housing,
  then remove spring (9) and spool (8).
• NOTE The following steps are for the
  installation of the transmission oil filter.
• Install spool (8), spring (9) and plug and seal
  (10) into transmission oil filter housing.
  Tighten plug to a torque of 47.5 6.8 Nm (35
  5 lb ft).
• Install a new O-ring seal (6) on the filter
  cover. Install filter element (5) on cover with
  nut (7). Tighten the nut to a torque of 13.6
  2.7 Nm (120 24 lb.in.). Install filter element
  assembly in transmission oil filter housing.
• Put transmission oil filter (1) on the transfer
  gear housing and install the four bolts (3) that
  hold it.

Copyright 1993 - 2021 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Sat Apr 3 083738 UTC0800 2021
14
Shutdown SIS
Previous Screen
Product WHEEL SCRAPER Model 621E WHEEL SCRAPER
6BB Configuration 621E TRACTOR-SCRAPER / POWER
SHIFT / 6BB00001-01234 (MACHINE) POWERED BY 3406
ENGINE
Disassembly and Assembly 621E, 623E, 627E
TRACTORS POWER TRAIN Media Number
-SENR3303-01 Publication Date -01/02/1991
Date Updated -10/03/2010
SENR33030024

• Drive Shaft Group With Retarder
• SMCS - 3120-011 3120-012 3120-015 3120-016
  3253
• Remove Drive Shaft Group With Retarder
• Remove the engine front hood and the engine rear
  hood. The weight of the hoods is approximately 33
  kg (73 lb) and 28 kg (62 lb) respectively.
• Remove the crankcase front guard and the
  crankcase rear guard. The weight of the guards is
  approximately 173 kg (381 lb) and 66 kg (146 lb)
  respectively.
• Remove flywheel housing oil pump.
• Remove the retarder valve on 627E Tractors.

5. Remove bolts (1). Remove cover (2) and the
O-ring seal on the back side of the cover.
15
6. Remove spiral lockring (3). Install a 3/8" -
16 NC bolt in one of the tapped holes (4) in the
end of the drive shaft.
7. Pull drive shaft (5) out approximately 610 mm
(24.0 in) as shown.
8. Loosen clamps (6) and slide hose (7) onto tube
assembly (8). Pry tube assembly (8) out of
housing (10). Remove tube assembly (8) and hose
(7). Remove the O-ring seal from tube assembly
(8). If necessary, remove bolts (9) and housing
(10) for easier removal of the tube assembly.
9. Disconnect hose (11) from the retarder housing.
10. Disconnect fitting (12).
16
11. Disconnect eighteen tube assemblies (13) from
the bracket.
12. Remove bolts and clips (14). Remove two bolts
(15), and move bracket (16) and tube assemblies
(10) forward out of the way.
13. Disconnect and plug the ends of two hydraulic
lines (17). Disconnect and plug the ends of two
fuel lines (18).
14. Install a 1/2" - 13 NC forged eyebolt in boss
(19) on top of the retarder housing and attach a
hoist.
17
NOTE On tractors not equipped with the retarder,
remove two of the bolts that hold the housing and
replace them with two 7/16" - 14 x 2 1/4" bolts
(19A). Remove the remaining bolts and nuts that
hold the housing. Install three 7/16" - 14 NC
forcing screws around the housing and force the
housing out against the heads of bolts (19A).
Fasten a 6V2156 Link Bracket (19B) and hoist to
the top of the housing. Remove bolts (19A) and
remove the drive shaft group. Lower the unit to
the ground. The weight of the unit is
approximately 36 kg (79 lb).
NOTE On tractors NOT equipped with the retarder,
proceed to Install Drive Shaft Group With
Retarder. 15. Remove ten bolts and two nuts that
hold the retarder housing (21) to the flywheel
housing. Install three 7/16" - 14 NC forcing
screws (20), and remove retarder housing and
drive shaft group. Lower the unit to the floor.
The weight of the unit is 96 Kg (212 lb).
Spring pressure is present behind plates.
16. Remove bolts (22) carefully and evenly to
release the spring pressure.
18
NOTE When bolts are removed, the discs, plates,
retainer and spring are free to fall.
17. Remove retainer (26), spring (25), plate
(24), one disc assembly (27), plate (23) and
other disc assembly (27) from the machine. The
retainer, spring, plate and discs as a unit have
a weight of 23 Nm (50 lb.).
Install Drive Shaft Group With Retarder
NOTE On tractors not equipped with the retarder,
fasten a 6V2156 Link Bracket (19B) and hoist to
the top of the drive shaft group housing.
Position the housing and install 7/161/4 two " -
24 x 2 "bolts (19A). Remove the hoist and link
bracket (19B). Install all but two bolts of the
bolts and nuts that hold the housing. Remove the
two bolts (19A), and install the last two bolts
that hold the drive shaft group housing. Then,
proceed to Step 15.
NOTE Friction discs (27) must be put in SAE 10W
oil for a minimum of one hour before installation.
19
1. Put friction discs (27) and friction plate
(23) in position in the flywheel housing. NOTE
The discs must be held in the flywheel housing
while installation of the parts and tooling is
made. NOTE Gear (28) must be removed from the
drive shaft and used to align the splines in the
friction discs.

• Put gear (28) in position in the flywheel. Make
  an alignment of the splines in the gear with the
  splines in friction discs (27).
• Put plate (24), spring (25) and retainer (26) in
  place in the flywheel housing. Install three of
  the bolts (22) loosely to hold the assembly in
  position.
• Put tooling (A) in position in gear (28) and the
  flywheel housing. Tooling (A) will put the discs
  and plate in a center position.
• Install the bolts that hold the assembly in
  place. Tighten the bolts to a torque of 56 7
  Nm (42
• 5 lb ft). Remove the gear and tooling (A).

1. Install gear (28) on the shaft. Install the plate
   and the two bolts that hold the gear on the
   shaft.
2. Install a 1/2" - 13 NC forged eyebolt in the top
   of the retarder housing and attach a hoist.

20

1. Install two 7/16" - 14 guide bolts (29), 127 mm
   (5.0 in.) long as shown, and lift the housing
   into position and slide it on the guide bolts and
   onto the studs.
2. Lift the housing into position and slide it onto
   the studs. Slowly, turn the engine to make an
   alignment of gear (28) and the friction discs.
   Install the nuts and bolts that hold the housing
   in position.

10. Slide drive shaft (5) in and make an
alignment of the external splines on the drive
shaft with the internal splines of the shaft in
the retarder housing.

1. Put tooling (B) in position in the bore of
   housing (10) to check alignment of the engine
   with the drive shaft. Make a rotation of tooling
   (B) in bore around the drive shaft until
   resistance is felt in both the clockwise and
   counterclockwise directions.
2. Find the center of free movement (travel) of
   tooling (B). This center is the direction the
   engine needs to be moved to make an alignment of
   the engine and drive shaft.
3. Inspect front and rear engine supports for
   damage. Make a replacement if necessary. Also,
   shims can be used to make an alignment of the
   engine and the drive shaft.
4. Pull the drive shaft at least two feet out the
   rear of the transmission. Remove tooling (B).

15. Remove the plugs from fuel lines (18) and
connect them. Remove the plugs from hydraulic
lines (17) and connect them.
21
16. Position bracket (16) and tube assemblies
(10). Install bolts (15). Install bolts and clips
(14).
17. Connect eighteen tube assemblies (13) to the
bracket.
18. Connect fitting (12).
19. Connect hose (11) to the retarder housing.
22

1. If housing (10) was removed, position it and
   install bolts (9) that hold it.
2. Make sure the O-ring seal is in position on the
   tube assembly. Put hose (7), clamps (6), and tube
   assembly (8) in position in the housing. Slide
   the hose in position and tighten clamps (6).
3. Install the drive shaft. See Step 10. Remove the
   bolt from the drive shaft.

23. Install spiral lockring (3).

• Make sure the O-ring seal is in position on the
  back side of cover (2). Position the cover and
  install bolts (1) that hold it.
• Install retarder valve.
• Install flywheel housing oil pump.
• Install the crankcase front and rear guards.
• Install the engine front and rear holds.
• Disassemble Drive Shaft Group With Retarder
• Start By
• remove drive shaft group with retarder

23
NOTE Shaft (4) is free to fall when plate (2) is
removed.

1. Remove two bolts (1), and remove plate (2). Use
   two pry bars and two wooden blocks to remove gear
   (3).
2. Remove shaft (4). Remove gear (5) from shaft (4).
   Remove race (6) if required.

3. Remove nine bolts (7). Use two 1/2" - 13 NC
forcing screws and remove cover (8).
4. Remove nut and washer (9).
24
5. Remove gear (10) and shaft (11) as a unit from
the cover.
6. Remove O-ring seal (12), washer (13), gear
(10) and washer (14) from shaft (11).
7. Remove bearing (15) from gear (10).
8. Remove O-ring seal (16). Remove bearing (17)
and remove lip type seal (18) from the cover.
25
9. Remove O-ring seal (19).

1. Remove twelve bolts (20), and remove stator (21).
2. Remove four bolts (22) from the opposite side.
   Remove retainer (23), deflector (24) and bearing
   (25).

12. Remove race (26) from the stator if necessary.
13. Remove rotor (27) from housing (28).
14. Remove three rings (29). The third ring is on
the opposite side of the rotor. If necessary,
remove retaining ring (30) and/or two carriers
(31). The second carrier is on the opposite side
of the rotor.
26
15. If necessary, remove race (32). Remove large
O-ring seal (33).
Assemble Drive Shaft Group With Retarder
1. Inspect all O-rings seals and lip type seals
for wear or damage.

1. Make sure O-ring seal (33) is in position on the
   rotor.
2. If race (32) was removed, lower the temperature
   of a new replacement and install it.

1. If removed during disassembly, install retaining
   ring (3) and/or two carriers (31). The second
   carrier is on the opposite side of the rotor.
2. Install three rings (29). The third ring is on
   the opposite side of the rotor.

27
6. Position rotor (27) in housing (28).
7. If race (26) was removed from the stator
during disassembly, lower the temperature of a
new replacement and install it.
8. Position bearing (25), deflector (24), and
retainer (23) in the stator. Put 9S3263 Thread
Lock on bolts (22), and install them from the
back side of the housing. Install twelve bolts
(20).
9. Install O-ring seal (19).
28
10. Install bearing (17). Install lip type seal
(18) in the cover with tool (A). Install the seal
with the lip down into the cover, and install the
seal even with the front of the counterbore.
Install O-ring seal (16).
11. Install bearing (15) in gear (10) with tool
(B).
12. Put washer (14), gear (10), washer (13) and
O-ring seal (12) in position on shaft (11). Put a
small amount of transmission oil on the O-ring
seal.
13. Install gear (10) and shaft (11) as a unit on
the cover.
29
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31
14. Install nut and washer (9). Tighten the nut
to a torque of 46 3 Nm (34 2 lb ft).
15. Position cover (8), and install bolts (7).
16. If race (6) was removed during disassembly,
heat a new replacement to 135 C (275 F) and
install it until the race makes a seat with the
shoulder of shaft (4). Install gear (5) on the
shaft.

• Gear (3) must remain off of shaft (4) until after
  the plate, discs, spring and retainer are
  installed on the flywheel.
• See the topic, Install Drive Shaft Group With
  Retarder, for the remainder of the assembly of
  drive shaft group with retarder.
• End By
• install drive shaft group with retarder

32
Shutdown SIS
Previous Screen
Product WHEEL SCRAPER Model 621E WHEEL SCRAPER
6BB Configuration 621E TRACTOR-SCRAPER / POWER
SHIFT / 6BB00001-01234 (MACHINE) POWERED BY 3406
ENGINE
Disassembly and Assembly 621E, 623E, 627E
TRACTORS POWER TRAIN Media Number
-SENR3303-01 Publication Date -01/02/1991
Date Updated -10/03/2010
SENR33030025
Transfer Gears, Torque Converter, Transmission
And Differential SMCS - 3003 3258-011
3258-012 Remove Transfer Gears, Torque
Converter, Transmission And Differential

• Start By
• turn the tractor so it is at a right angle to the
  scraper
• remove the drive axles. (see topic, Drive Axles)
• remove the implement and elevator pumps
• This operation is located in the 623E Tractor
  Scraper, Vehicle Systems Disassembly And Assembly
  Module, Form No. SENR3318-01

33
1. Remove two plugs (1) and drain the oil from
the transmission. Remove plug (2) and drain the
oil from the differential case.
2. Disconnect hose (3). Remove bolt and clip (4),
and disconnect wire (5). Remove two bolts (6),
and remove guard (7).
3. Remove bolt and clip (8). Disconnect wire (9).
4. Attach tooling (A) to transmission guard (10),
remove bolts and remove guard.
34
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