Caterpillar Cat 627G WHEEL SCRAPER (Prefix AYK) Service Repair Manual Instant Download.pdf

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Product: WHEEL SCRAPER
Model: 627G WHEEL SCRAPER AYK
Configuration: 627G WHEEL SCRAPER AYK00001-UP (MACHINE) POWERED BY 3306 Engine
Disassembly and Assembly
627G Wheel Scraper Power Train
Media Number -RENR1557-02 Publication Date -01/12/2001 Date Updated -20/08/2018
i02154878
Transmission Oil Filter - Install
SMCS - 3067-012
Installation Procedure
Illustration 1 g00822255
1. Position transmission oil filter (1).
2. Install bolts (2).
3. Install drain plug (3).
4. Refill the transmission oil. Refer to Operation and Maintenance Manual, "Lubrication
Viscosities and Refill Capacities".
Copyright 1993 - 2021 Caterpillar Inc.
All Rights Reserved.
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i02047031
Transmission Electronic Control Module - Remove and
Install
SMCS - 3168-010
Removal Procedure
Start By:
a. Remove the hood. Refer to the Engine Supplement for the scraper Disassembly and
Assembly, "Hood - Remove and Install".
Note: Put identification marks on all hoses, on all hose assemblies on all wires, and on all tube
assemblies for installation purposes. Plug all hose assemblies and plug all tube assemblies. This
helps prevent fluid loss, and this helps keep contaminants from entering the system.
1. Turn the battery disconnect switch to the OFF position.
2. Disconnect harness assemblies (1).
3. Remove bolts (2) and transmission electronic control module (3).
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1. Position transmission electronic control module (3) and install bolts (2).
2. Connect harness assemblies (1).
3. Turn the battery disconnect switch to the ON position.
End By:
a. Install the hood. Refer to the Engine Supplement for the scraper Disassembly and
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i07349781
Transmission Hydraulic Control Valve - Remove and Install -
Scraper
SMCS - 3073-010
Removal Procedure
1. Disconnect hose assembly (1) and fittings (2). Remove clips (5). Remove bolts (3) and
cover (4).
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2. Remove plate (6), bolts (7), and valve body (8).
3. Remove plate (9).
4. Remove plate (10).
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Note: Take extra care when removing valves (12).
5. Remove plate (11) and valves (12) as a unit.
6. remove bolts (13) and shift cylinder assembly (14).
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7. Remove bolts (16). Move valve body (15) away from tubes (17). Move valve body (15)
toward the front of the tractor. Remove valve body (15).
8. Remove three tubes (17). Remove O-ring seals (18) from three tubes (17).
1. Install valve body (15) in the reverse order of removal.
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i02304746
Transmission Hydraulic Control Valve - Remove
SMCS - 3073-011
Removal Procedure
Start By:
a. Remove the hood. Refer to the engine supplement for the scraper Disassembly and
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.
1. Drain the transmission oil into a suitable container for storage or disposal. The capacity of
the transmission is approximately 53 L (14 US gal).
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Note: Do not disconnect any hose assemblies. Do not disconnect any harness assemblies.
2. Reposition harness assembly (2), harness assembly (3), and harness assembly (4) in order to
remove cover (1).
3. Remove cover (1).
4. Remove the gasket.
5. Remove bolts (5).
6. Remove transmission hydraulic control valve (6).
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7. Remove plate (7). Remove manifold (8).
8. Remove selector valve (9).
9. Loosen the shift cylinder. Remove bolts (13). Disconnect priority valve (11) from tube (10).
Disconnect priority valve (11) from tubes (12). Remove priority valve (11).
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i02310162
Transmission Hydraulic Control Valve - Disassemble
SMCS - 3073-015
Disassembly Procedure
Table 1
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.
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Note: Hold each cover securely in order to contain the spring pressure when you remove the
bolts.
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).
3. Remove cover (1) and cover (2). Remove piston (4). Remove spool (5).
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4. Remove piston (4), spring (6), and spring (7). Remove spacers (8).
5. Remove slug (13).
6. Use Tooling (A) in order to remove retaining ring (12).
7. Remove retainer (11). Remove spring (10).
8. Remove plunger (9) from spool (5).
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9. Remove spool (14). Remove stop (15).
10. Remove spring (16).
11. Remove slug (20) and remove spool (19).
12. Remove spring (18). Remove washer (17).
13. Remove load spool (21). Remove speed spool (22).
14. If necessary, loosen locknuts (24) and remove links (23) from spools (21) and (22).
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Note: Hold the cover securely in order to contain the spring pressure when you remove the
bolts.
15. Remove bolts (25) and cover (26).
16. Remove spring (29) and spool assembly (30).
17. Use Tooling (A) to remove retaining ring (34) from spool (30).
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18. Remove retainer (33), spring (32), and plunger (31).
19. If necessary, remove dowel (27) and remove stop (28).
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i07349785
Transmission Hydraulic Control Valve - Disassemble -
Scraper
SMCS - 3073-015
Disassembly Procedure
Start By:
a. Remove the transmission hydraulic control valve (scraper).
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Note: Hold each cover securely to contain the spring pressure when you remove the bolts.
3. Remove piston (5), spring (7), spring (8), spacers (9), and spool assembly (6).
4. Remove slug (14), retaining ring (13), retainer (12), spring (11), and plunger (10) from
spool assembly (6).
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5. Remove spool (15), spring (18), washer (19), and spring (20).
6. Remove slug (22), spool (21), and spool (16).
7. Remove load spool (22) and speed spool (23).
8. If necessary, loosen locknuts (25) and remove links (24) from load spool (22) and speed
spool (23).
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Note: Hold the cover securely to contain the spring pressure when you remove the bolts.
9. Remove bolts (26), cover (27), spring (30), and spool assembly (31).
10. Remove retaining ring (35), retainer (34), spring (33), and plunger (32) from spool assembly
(31).
11. If necessary, remove dowel (28) and stop (29).
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12. Remove solenoid assemblies (30) and O-rings (31). Remove cover (32).
13. Loosen lock nut (35) and remove link (36) from valve spool (34). Remove valve spool (34),
retainer (33), and the ball from the body.
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i02310163
Transmission Hydraulic Control Valve - Assemble
SMCS - 3073-016
Assembly Procedure
Table 1
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.
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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).
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injury.
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 N·m
(22 ± 3 lb ft).
6. If necessary, install links (23) and tighten locknuts (24) onto spools (21) and (22).
7. Install load spool (21). Install speed spool (22).
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8. Install spool (19). Install slug (20).
9. Install spring (18). Install washer (17).
10. Install spring (16).
11. Install spool (14). Install stop (15).
injury.
12. Install plunger (9) to spool (5).
13. Install spring (10). Install retainer (11).
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14. Use Tooling (A) in order to install retaining ring (12).
15. Install slug (13).
16. Install spacers (8). Install spring (6), spring (7), and spool (4).
injury.
17. Install spool (5). Install piston (4).
Note: Hold each cover securely while you tighten the bolts.
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18. Position cover (2). Install bolts (2A). Tighten bolts (2A) to a torque of 30 ± 4 N·m
(22 ± 3 lb ft).
19. Install cover (1). Install bolts (3). Tighten bolts (3) to a torque of 30 ± 4 N·m (22 ± 3 lb ft).
End By:
a. Install the transmission hydraulic control valve. Refer to Disassembly and Assembly,
"Transmission Hydraulic Control Valve - Install".
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i07349808
Transmission Hydraulic Control Valve - Assemble - Scraper
SMCS - 3073-016
Assembly Procedure
1. Install retainer (39) in the body. Install ball (43) in the hole in retainer (39). Turn retainer
(39) until ball (43) falls into the pocket in the body. Install valve spool (40). Install lock nut
(41) onto link (42) and install link (42) on valve spool (40).
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2. Install solenoids (36). Tighten the cartridge of the solenoid to a torque of 50 ± 5 N·m
(37 ± 4 lb ft). Tighten the nut that holds the coil assembly to a torque of 9.0 ± 0.5 N·m
(80 ± 5 lb in). Install O-rings (37). Be sure that the O-ring seals are in place on cover (38).
Install cover (38).
3. Adjust link (42) until Dimension (X) is 50.0 ± 0.8 mm (1.97 ± 0.032 inch). Tighten locknut
(41) to a torque of 34 ± 7 N·m (25 ± 5 lb ft).
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injury.
4. Install stop (29) and dowel (28).
5. Install plunger (32), spring (33), retainer (34), and retaining ring (35) into spool assembly
(31).
Note: Hold the cover securely while you install the bolts.
6. Install spool assembly (31), spring (30), cover (27), and bolts (26). Tighten bolts (26) to a
torque of 30 ± 4 N·m (22 ± 3 lb ft).
7. Install links (24) and tighten locknuts (25) onto load spool (22) and speed spool (23).
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8. Install load spool (22) and speed spool (23).
9. Install spool (16), spool (21), and slug (22).
10. Install spring (20), washer (19), spring (18), and spool (15).
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11. Install plunger (10), spring (11), retainer (12), retaining ring (13), and slug (14) into spool
assembly (6).
12. Install washers (9), spool assembly (6), spring (8), spring (7), and piston (5).
injury.
Note: Hold each cover securely while you tighten the bolts.
13. Install cover (2) and bolts (4). Tighten bolts (4) to a torque of 30 ± 4 N·m (22 ± 3 lb ft).
14. Install cover (1) and bolts (3). Tighten bolts (3) to a torque of 30 ± 4 N·m (22 ± 3 lb ft).
End By:
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a. Install the transmission hydraulic control valve (scraper).
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Caterpillar Cat 627G WHEEL SCRAPER (Prefix AYK) Service Repair Manual Instant Download.pdf

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