Caterpillar Cat 637G WHEEL SCRAPER (Prefix AWE) Service Repair Manual (AWE00001 and up)

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Product WHEEL SCRAPER Model 637G WHEEL SCRAPER
AWE Configuration 637G WHEEL SCRAPER-COAL BOWL
AWE00001-UP (MACHINE) POWERED BY 3306 Engine
Disassembly and Assembly 637G Wheel
Tractor-Scraper Power Train Media Number
-RENR4074-01 Publication Date -01/04/2005
Date Updated -16/05/2005
i02310162
Transmission Hydraulic Control Valve -
Disassemble SMCS - 3073-015 Disassembly
Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Description Qty
A 1P-1853 Retaining Ring Pliers 1
Start By a. Remove the transmission hydraulic
control valve. Refer to Disassembly and Assembly,
"Transmission Hydraulic Control Valve -
Remove". NOTICE Care must be taken to ensure
that fluids are contained during performance of
inspection, maintenance, testing, adjusting, and
repair of the product. Be prepared to collect
the fluid with suitable containers before
opening any compartment or disassembling any
component containing fluids. Refer to Special
Publication, NENG2500, "Dealer Service Tool
Catalog" for tools and supplies suitable to
collect and contain fluids on Cat
products. Dispose of all fluids according to
local regulations and mandates.
2
Note Hold each cover securely in order to
contain the spring pressure when you remove the
bolts.
Illustration 1
g01096879
Personal injury can result from being struck by
parts propelled by a released spring force. Make
sure to wear all necessary protective
equipment. Follow the recommended procedure and
use all recommended tooling to release the
spring force.

1. Remove bolts (3) from cover (1).
2. Remove bolts (2A) from cover (2).

Illustration 2 g01034814 3. Remove cover (1) and
cover (2). Remove piston (4). Remove spool (5).
3
Illustration 3
g01034815
Personal injury can result from being struck by
parts propelled by a released spring force. Make
sure to wear all necessary protective
equipment. Follow the recommended procedure and
use all recommended tooling to release the
spring force.

1. Remove piston (4), spring (6), and spring (7).
   Remove spacers (8).
2. Remove slug (13).
3. Use Tooling (A) in order to remove retaining ring
   (12).
4. Remove retainer (11). Remove spring (10).
5. Remove plunger (9) from spool (5).

Illustration 4
g00822724
4

1. Remove spool (14). Remove stop (15).
2. Remove spring (16).
3. Remove slug (20) and remove spool (19).
4. Remove spring (18). Remove washer (17).

Illustration 5 g01096790 13. Remove load spool
(21). Remove speed spool (22).
Illustration 6 g01096791 14. If necessary,
loosen locknuts (24) and remove links (23) from
spools (21) and (22).
5
Illustration 7
g01096792
Personal injury can result from being struck by
parts propelled by a released spring force. Make
sure to wear all necessary protective
equipment. Follow the recommended procedure and
use all recommended tooling to release the
spring force.
Note Hold the cover securely in order to contain
the spring pressure when you remove the
bolts. 15. Remove bolts (25) and cover (26).
Illustration 8
g01096793
Personal injury can result from being struck by
parts propelled by a released spring force. Make
sure to wear all necessary protective
equipment. Follow the recommended procedure and
use all recommended tooling to release the
spring force.

1. Remove spring (29) and spool assembly (30).
2. Use Tooling (A) to remove retaining ring (34)
   from spool (30).

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1. Remove retainer (33), spring (32), and plunger
   (31).
2. If necessary, remove dowel (27) and remove stop
   (28).

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Licensees.
Sun Jul 25 003104 UTC0800 2021
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Product WHEEL SCRAPER Model 637G WHEEL SCRAPER
AWE Configuration 637G WHEEL SCRAPER-COAL BOWL
AWE00001-UP (MACHINE) POWERED BY 3306 Engine
Disassembly and Assembly 637G Wheel
Tractor-Scraper Power Train Media Number
-RENR4074-01 Publication Date -01/04/2005
Date Updated -16/05/2005
i02310163
Transmission Hydraulic Control Valve -
Assemble SMCS - 3073-016 Assembly
Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Description Qty
A 1P-1853 Retaining Ring Pliers 1
NOTICE Keep all parts clean from
contaminants. Contamination of the hydraulic
system with foreign material will reduce the
service life of the hydraulic system
components. To prevent contaminants from
entering the hydraulic system, always plug or
cap the lines, fittings, or hoses as they are
disconnected. Cover any disassembled components
and clean them properly before assembly. Clean
the hydraulic system properly after any major
component exchange or especially after a
component failure, to remove any contamination.
9
Illustration 1
g01096793
Improper assembly of parts that are spring loaded
can cause bodily injury. To prevent possible
injury, follow the established assembly procedure
and wear protective equipment.

1. If necessary, install dowel (27) and install stop
   (28).
2. Install retainer (33), spring (32), and plunger
   (31).
3. Use Tooling (A) to install retaining ring (34)
   onto spool (30).
4. Install spring (29) and spool assembly (30).

Illustration 2
g01096792
10
Improper assembly of parts that are spring loaded
can cause bodily injury. To prevent possible
injury, follow the established assembly procedure
and wear protective equipment.
Note Hold the cover securely while you install
the bolts. 5. Position cover (26). Install bolts
(25). Tighten bolts (25) to a torque of 30 4
Nm (22 3 lb ft).
Illustration 3 g01096791 6. If necessary,
install links (23) and tighten locknuts (24) onto
spools (21) and (22).
Illustration 4 g01096790 7. Install load spool
(21). Install speed spool (22).
11
Illustration 5
g00822724

1. Install spool (19). Install slug (20).
2. Install spring (18). Install washer (17).
3. Install spring (16).
4. Install spool (14). Install stop (15).

Illustration 6
g01034815
Improper assembly of parts that are spring loaded
can cause bodily injury. To prevent possible
injury, follow the established assembly procedure
and wear protective equipment.

1. Install plunger (9) to spool (5).
2. Install spring (10). Install retainer (11).

12

1. Use Tooling (A) in order to install retaining
   ring (12).
2. Install slug (13).
3. Install spacers (8). Install spring (6), spring
   (7), and spool (4).

Illustration 7
g01034814
Illustration 8
g01096879
Improper assembly of parts that are spring loaded
can cause bodily injury. To prevent possible
injury, follow the established assembly procedure
and wear protective equipment.
17. Install spool (5). Install piston (4). Note
Hold each cover securely while you tighten the
bolts.
13

• Position cover (2). Install bolts (2A). Tighten
  bolts (2A) to a torque of 30 4 Nm (22 3 lb
  ft).
• Install cover (1). Install bolts (3). Tighten
  bolts (3) to a torque of 30 4 Nm (22 3 lb
  ft).
• End By
• a. Install the transmission hydraulic control
  valve. Refer to Disassembly and Assembly,
  "Transmission Hydraulic Control Valve - Install".

Copyright 1993 - 2021 Caterpillar Inc. All
Rights Reserved. Private Network For SIS
Licensees.
Sun Jul 25 003159 UTC0800 2021
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Product WHEEL SCRAPER Model 637G WHEEL SCRAPER
AWE Configuration 637G WHEEL SCRAPER-COAL BOWL
AWE00001-UP (MACHINE) POWERED BY 3306 Engine
Disassembly and Assembly 637G Wheel
Tractor-Scraper Power Train Media Number
-RENR4074-01 Publication Date -01/04/2005
Date Updated -16/05/2005
i02304747
Transmission Hydraulic Control Valve -
Install SMCS - 3073-012 Installation
Procedure NOTICE Keep all parts clean from
contaminants. Contamination of the hydraulic
system with foreign material will reduce the
service life of the hydraulic system
components. To prevent contaminants from entering
the hydraulic system, always plug or cap the
lines, fittings, or hoses as they are
disconnected. Cover any disassembled components
and clean them properly before assembly. Clean
the hydraulic system properly after any major
component exchange or especially after a
component failure, to remove any contamination.
15
Illustration 1 g01096669 1. Position priority
valve (11). Connect priority valve (11) onto
tubes (12). Connect priority valve (11) onto
tube (10). Tighten the shift cylinder. Install
bolts (13).
Illustration 2
g01096667
2. Install selector valve (9).
Illustration 3
g01096666
3. Install manifold (8). Install plate (7).
16

• Illustration 4 g00822714
• Position transmission hydraulic control valve
  (6).
• Install bolts (5). Tighten bolts (5) to a torque
  of 30 4 Nm (22 3 lb ft).
• Install the gasket.

• Illustration 5 g01096780
• Reposition harness assembly (2), harness assembly
  (3), and harness assembly (4) when you install
  cover (1).
• Install cover (1).
• Refill the transmission oil. Refer to Operation
  and Maintenance Manual, "Lubrication Viscocities
  and Refill Capacities".
• End By
• a. Install the hood. Refer to the engine
  supplement for the scraper Disassembly and
  Assembly, "Hood - Remove and Install".

Copyright 1993 - 2021 Caterpillar Inc. All
Rights Reserved. Private Network For SIS
Licensees.
Sun Jul 25 003255 UTC0800 2021
17
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Product WHEEL SCRAPER Model 637G WHEEL SCRAPER
AWE Configuration 637G WHEEL SCRAPER-COAL BOWL
AWE00001-UP (MACHINE) POWERED BY 3306 Engine
Disassembly and Assembly 637G Wheel
Tractor-Scraper Power Train Media Number
-RENR4074-01 Publication Date -01/04/2005
Date Updated -16/05/2005
i01659901
Drive Shaft - Remove SMCS - 3253-011 Removal
Procedure 1. Move the ejector forward.
Illustration 1
g00844512
2. Remove guard (1). Remove block (2) .
18
Illustration 2 g00844513 3. Remove eight bolts
(3). The bolts must be discarded. Remove drive
shaft (4). The drive shaft weighs approximately
30 kg (65 lb). Use two people in order to remove
the drive shaft.
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Product WHEEL SCRAPER Model 637G WHEEL SCRAPER
AWE Configuration 637G WHEEL SCRAPER-COAL BOWL
AWE00001-UP (MACHINE) POWERED BY 3306 Engine
Disassembly and Assembly 637G Wheel
Tractor-Scraper Power Train Media Number
-RENR4074-01 Publication Date -01/04/2005
Date Updated -16/05/2005
i01659905
Drive Shaft - Install SMCS - 3253-012 Installatio
n Procedure
Illustration 1 g00844513 1. Install drive shaft
(4). The drive shaft weighs approximately 30 kg
(65 lb). Use two people in order to install the
drive shaft. Install eight bolts (3). Bolts (3)
must be replaced with new bolts. The bolts must
be torqued properly. For the proper torque, refer
to Specifications, "Drive Shaft" for the Scraper
Power Train.
20
Illustration 2
g00844512
2. Install block (2). Install guard (1) .
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Product WHEEL SCRAPER Model 637G WHEEL SCRAPER
AWE Configuration 637G WHEEL SCRAPER-COAL BOWL
AWE00001-UP (MACHINE) POWERED BY 3306 Engine
Disassembly and Assembly 637G Wheel
Tractor-Scraper Power Train Media Number
-RENR4074-01 Publication Date -01/04/2005
Date Updated -16/05/2005
i01655983
Axle Shaft - Remove SMCS - 3259-011 Removal
Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Description Quantity
A 138-7575 Link Bracket 1
B 1P-7407 Eyebolt 1
NOTICE Care must be taken to ensure that fluids
are contained during performance of inspection,
maintenance, testing, adjusting and repair of
the product. Be prepared to collect the fluid
with suitable containers before opening any
compartment or disassembling any component
containing fluids. Refer to Special Publication,
NENG2500, "Caterpillar Tools and Shop Products
Guide" for tools and supplies suitable to collect
and contain fluids on Caterpillar
products. Dispose of all fluids according to
local regulations and mandates.
22
Illustration 1 g00843570 1. Remove drain plug
(1) in order to drain the final drive. The
capacity of the final drive is approximately 19
L (5 US gal).
Illustration 2 g00843571 2. Install Tool (A) to
cover (2). Install a suitable lifting device to
Tool (A). Remove the cover. The cover weighs
approximately 32 kg (70 lb).
Illustration 3
g00843572
23
3. Install Tool (B) to axle shaft (3). Partially
remove the axle shaft.
Illustration 4 g00843573 4. Install a suitable
lifting device to axle shaft (3). Remove the axle
shaft. The right axle shaft weighs approximately
41 kg (90 lb). The left axle shaft weighs
approximately 68 kg (150 lb).
Copyright 1993 - 2021 Caterpillar Inc. All
Rights Reserved. Private Network For SIS
Licensees.
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Product WHEEL SCRAPER Model 637G WHEEL SCRAPER
AWE Configuration 637G WHEEL SCRAPER-COAL BOWL
AWE00001-UP (MACHINE) POWERED BY 3306 Engine
Disassembly and Assembly 637G Wheel
Tractor-Scraper Power Train Media Number
-RENR4074-01 Publication Date -01/04/2005
Date Updated -16/05/2005
i01656019
Axle Shaft - Install SMCS - 3259-012 Installation
Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Description Qty
A 138-7575 Link Bracket 1
B 1P-7407 Eyebolt 1
NOTICE Keep all parts clean from
contaminants. Contaminants may cause rapid wear
and shortened component life.
25
Illustration 1 g00843573 1. Install a suitable
lifting device to axle shaft (3). Partially
install the axle shaft. The right axle shaft
weighs approximately 41 kg (90 lb). The left axle
shaft weighs approximately 68 kg (150 lb).
Illustration 2
g00843572
2. Install the axle shaft. Remove Tool (B) .
Illustration 3
g00843571
26

1. Install Tool (A) to cover (2). Install a suitable
   lifting device to Tool (A). Install the cover.
   The cover weighs approximately 32 kg (70 lb).
2. Refill the final drive. Refer to Operation and
   Maintenance Manual, "Capacities (Refill)".

Copyright 1993 - 2021 Caterpillar Inc. All
Rights Reserved. Private Network For SIS
Licensees.
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Product WHEEL SCRAPER Model 637G WHEEL SCRAPER
AWE Configuration 637G WHEEL SCRAPER-COAL BOWL
AWE00001-UP (MACHINE) POWERED BY 3306 Engine
Disassembly and Assembly 637G Wheel
Tractor-Scraper Power Train Media Number
-RENR4074-01 Publication Date -01/04/2005
Date Updated -16/05/2005
i01656077
Axle Shaft Guard - Remove and Install SMCS -
7185-010 Removal Procedure Start By A. Remove
the left axle shaft. Refer to Disassembly and
Assembly, "Axle Shaft - Remove". NOTICE Care
must be taken to ensure that fluids are contained
during performance of inspection, maintenance,
testing, adjusting and repair of the product. Be
prepared to collect the fluid with suitable
containers before opening any compartment or
disassembling any component containing
fluids. Refer to Special Publication, NENG2500,
"Caterpillar Tools and Shop Products Guide" for
tools and supplies suitable to collect and
contain fluids on Caterpillar products. Dispose
of all fluids according to local regulations and
mandates.
1. Drain the differential into a suitable
container. The capacity of the differential is 12
L (3 US gal).
28
Illustration 1 g00845448 2. Disconnect the hose
assembly (1). Disconnect the retainer (2). Slide
the retainer toward the differential and bevel
gear.

• Illustration 2 g00845557
• Remove four bolts (3). Remove the guard.
• Remove two O-ring seals from the tube assembly.
• Installation Procedure
• 1. Install two O-ring seals to the tube assembly.

29
Illustration 3
g00845557
2. Install the guard. Install four bolts (3) .

• Illustration 4 g00845448
• Slide the retainer toward the left axle housing.
  Connect the retainer (2). Connect the hose
  assembly (1) .
• Refill the differential. Refer to Operation and
  Maintenance Manual, "Capacities (Refil)".

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Rights Reserved. Private Network For SIS
Licensees.
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Product WHEEL SCRAPER Model 637G WHEEL SCRAPER
AWE Configuration 637G WHEEL SCRAPER-COAL BOWL
AWE00001-UP (MACHINE) POWERED BY 3306 Engine
Disassembly and Assembly 637G Wheel
Tractor-Scraper Power Train Media Number
-RENR4074-01 Publication Date -01/04/2005
Date Updated -16/05/2005
i01590210

• Power Pack - Remove
• SMCS - 1000-011 3030-011
• Removal Procedure
• Start By
• Remove the hood. Refer to the engine supplement
  for the scraper Disassembly and Assembly, "Hood
  - Remove and Install".
• Remove the hook. Refer to machine systems
  Disassembly and Assembly, "Hook - Remove and
  Install".

Hot engine components can cause injury from
burns. Before performing maintenance on the
engine, allow the engine and the components to
cool.
Fuel leaked or spilled onto hot surfaces or
electrical components can cause a fire. To help
prevent possible injury, turn the start switch
off when changing fuel filters or water
separator elements. Clean up fuel spills
immediately.
31
NOTICE Care must be taken to ensure that fluids
are contained during performance of inspection,
maintenance, testing, adjusting, and repair of
the product. Be prepared to collect the fluid
with suitable containers before opening any
compartment or disassembling any component
containing fluids. Refer to Special Publication,
NENG2500, "Dealer Service Tool Catalog" for
tools and supplies suitable to collect and
contain fluids on Cat products. Dispose of all
fluids according to local regulations and
mandates.

• Illustration 1 g00824437
• Disconnect battery cables (1) at the batteries.
• Remove cover (2) and two brackets (3). Remove
  battery cables (1) from the battery box.

Illustration 2
g00824444
3. Disconnect three plugs (4).
32
Illustration 3 g00830088 4. Disconnect two plugs
(7). Remove wiring harness (6) from clip (5).
Illustration 4 g00830089 5. Disconnect two plugs
(8). Remove clip (9).
Illustration 5
g00830091
6. Remove cover (10).
33
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Illustration 6 g00830101 7. Disconnect plug (11)
and pull the wiring harness through tube (12).
Illustration 7 g00824312 8. Turn fuel shutoff
valve (13) to the OFF position.
Illustration 8 g00830112 9. Turn fuel shutoff
valve (14) to the OFF position. Disconnect four
hose assemblies (15).
36
Illustration 9 g00830121 10. Attach a suitable
lifting device to lifting eye assembly (16).
Illustration 10 g00830209 11. Disconnect drive
shaft (17) from the transfer gears.

• Illustration 11 g00830117
• Remove clip (18). Remove two bolts (19).
• Repeat Step 12 at each corner of the power pack.
• Remove the power pack. The weight of the power
  pack is approximately 3085 kg (6800 lb).

37
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Rights Reserved. Private Network For SIS
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