Caterpillar Cat 623G Wheel Scraper (Prefix CEW) Service Repair Manual Instant Download.pdf

Product: WHEEL SCRAPER
Model: 623G WHEEL SCRAPER CEW
Configuration: 623G Wheel Scraper CEW00001-UP (MACHINE)
Disassembly and Assembly
623G Wheel Tractor-Scraper Machine Systems
Media Number -RENR4249-00 Publication Date -01/06/2004 Date Updated -21/06/2004
i02509987
Piston Pump (Cushion-Hitch) - Disassemble
SMCS - 5070-015; 5316-015
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-0510 Driver Group 1
B 1P-1854 Pliers 1
C 1P-1857 Pliers 1
Start By:
A. Remove the piston pump (cushion-hitch). Refer to Disassembly and Assembly, "Piston
Pump (Cushion-Hitch) - 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 Dealer Service
Tool Catalog" for tools and supplies suitable to collect and contain
fluids on Caterpillar products.
Dispose of all fluids according to local regulations and mandates.
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https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...

1. Apply alignment marks on all mating components for assembly purposes.
Illustration 1 g01071362
2. Remove bolts (1) and valve (2) .
3. Remove O-ring seals (3) and screw (4A) .
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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.
4. Remove plug (11) and O-ring seal (12) .
5. Remove seat (10) , spring (9) , spring (8) , retainer (7) , and spool (6) .
6. Remove plug (19) and O-ring seal (20) .
7. Remove spring (18) , spring (17) , retainer (16) , and spool (15) .
8. Remove plug (4) , washer (5) , plug (13) , and washer (14) from housing (2) .
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Note: Pump head (22) is under spring tension. Remove bolts (21) slowly.
9. Carefully remove bolts (21) that secure pump head (22) to the pump assembly.
10. Remove pump head (22) , plate (23) , piston (24) , plunger (25) , and spring (26) as a unit
from pump housing (27) .
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11. Remove plunger (25) , spring (26) , four O-ring seals (28) , piston (24) , and plate (23) from
pump head (22) .
12. Plate (23) has been turned over by 180 degrees. Note the location of Slot (X) that is in plate
(23) for assembly purposes. Slot (X) will be positioned over locating pin (29) when plate
(23) is installed to the pump head.
13. Plunger guide (30) and piston guide (32) will not be removed from the head. If either
cylinder (30) or guide (32) are damaged pump head (22) must be replaced. Remove pin (29)
from pump head (22) . Use a suitable heel bar and remove bearing cup (31) from pump head
(22) .
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14. Remove plugs (33) from pump head (22) . Remove the O-ring seals from plugs (33) .
15. Remove bearing cone (34) and shim (35) from shaft (37) . Remove O-ring seal (36) from
pump housing (27) .
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16. Turn the pump housing over 180 degrees and hold the components in the pump housing.
Remove pump housing (27) from bearing cone (38) , shaft (37) , swashplate (39) , and
rotating group (40) .
17. Remove shaft (37) and bearing cone (38) from swashplate (39) and rotating group (40) .
18. Use Tooling (A) and a suitable press in order to remove shaft (37) from bearing cone (38) .
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19. Remove swashplate (39) from rotating group (40) .
20. Apply identification marks to retraction plate (41) , pistons (42) , and barrel (43) for
assembly purposes. The pistons must be installed in the original location in retraction plate
(41) and in barrel (43) . All three components must be assembled to the original alignment.
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21. Remove collar bearing (45) from pins (44) and barrel (43) .
22. Place barrel (43) in a suitable press. Use Tooling (A) in order to depress the spring that is in
barrel (43) . Use Tooling (B) in order to remove retaining ring (46) that secures the spring in
barrel (43) . Slowly release the pressure from the spring and remove Tooling (A) from the
assembly.
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23. Remove retaining ring (46) and spring (47) from barrel (43) .
24. Remove seat (48) that was under spring (47) from barrel (43) . Remove pins (44) from
barrel (43) .
25. Remove brass bearings (49) from pump housing (27) .
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26. Use Tooling (C) in order to remove retaining ring (50) from pump housing (27) .
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27. Lip seal (51) and bearing cup (52) will be removed from pump housing (27) together.
28. Use Tooling (A) in order to remove lip seal (51) and bearing cup (52) from pump housing
(27) .
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Product: WHEEL SCRAPER
Model: 623G WHEEL SCRAPER CEW
Configuration: 623G Wheel Scraper CEW00001-UP (MACHINE)
Disassembly and Assembly
623G Wheel Tractor-Scraper Machine Systems
Media Number -RENR4249-00 Publication Date -01/06/2004 Date Updated -21/06/2004
i03538320
Piston Pump (Cushion-Hitch) - Assemble
SMCS - 5070-016; 5316-016
Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-0510 Driver Group 1
B 1P-1854 Pliers 1
C 1P-1857 Pliers 1
D 8T-5096 Dial Indicator Gp 1
E 5N-5561 Silicone Lubricant 1
F 9S-3263 Thread Lock Compound 1
Note: Cleanliness is an important factor. Before assembly, all parts should be thoroughly cleaned
in cleaning fluid. Allow the parts to air dry. Wiping cloths or rags should not be used to dry parts.
Lint may be deposited on the parts which may cause later trouble. Inspect all parts. If any parts are
worn or damaged, use new Caterpillar parts for replacement.
Note: Apply a light film of 10W oil to all components before assembly.
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1. Use Tooling (C) in order to install retaining ring (50) to pump housing (27) .
2. Use Tooling (A) in order to install lip seal (51) to the pump housing. The sealing lip of the
lip seal should face toward the bearing cup. The lip seal must seat against the retaining ring.
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3. Lower the temperature of bearing cup (52) . Use Tooling (A) in order to install bearing cup
(52) to pump housing (27) . Install bearing cup (52) until the bearing cup seats.
4. Use the following steps to determine the preload on the bearings of the pump assembly.
a. Lower the temperature of shaft (37) . Use a suitable press in order to install shaft (37)
into bearing cone (38) . Install shaft (37) until bearing cone (38) is seated onto shaft
(37) .
b. Install shaft (37) into pump housing (27) .
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c. Install shim (35) and bearing cone (34) on pump shaft (37) .
d. Lower the temperature of bearing cup (31) . Use Tooling (A) and a suitable press in
order to install bearing cup (31) in pump head (22) . Install the bearing cup until the
cup is seated.
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e. Position pump head (22) onto pump housing (27) . Install bolts (21) but do not tighten
bolts (21) at this point.
f. Use a feeler gauge to measure the distance between the pump head and the pump
housing. Take measurements at three equal locations on the surface between the
pump head and the pump housing.
g. The average of the three dimension should be zero to 0.050 mm (0.0020 inch).
h. If the dimension is not correct remove shim (35) . Refer to Illustration 6. To achieve
the correct dimension, grind the shim or replace shim (35) .
i. When the correct dimension is achieved tighten bolts (21) and then invert the pump
assembly.
j. Use Tooling (D) , a suitable screwdriver, and a set of slip joint pliers to check the end
play on shaft (37) . If end play exists on the shaft, repeat Step 4 until the correct
dimension is reached.
k. Remove bolts (21) and pump head (22) from pump housing (27) . Remove bearing
cone (34) and shim (35) from shaft (37) . Remove shaft (37) .
l. Proceed with the assembly of the piston pump.
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5. Install brass bearings (49) into pump housing (27) .
6. Install pins (44) into barrel (43) .
7. Install seat (48) in order to secure pins (44) in barrel (43) .
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8. Position barrel (43) in a suitable press. Install spring (47) in barrel (43) . Position retaining
ring (46) on top of the spring.
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.
9. Position Tooling (A) and the suitable press on top of the spring and inside of retaining ring
(46) . Use Tooling (A) in order to depress the spring that is in barrel (43) . Use Tooling (B)
in order to install retaining ring (46) that secures the spring in barrel (43) . Remove Tooling
(A) .
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10. Install collar bearing (45) to pins (44) and barrel (43) .
11. Install pistons (42) to the original positions in retraction plate (41) . Install pistons (42) and
retraction plate (41) to barrel (43) . Pistons (42) must be installed to the original positions.
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12. Position swashplate (39) to rotating group (40) .
13. Install shaft (37) and bearing cone (38) to swashplate (39) and rotating group (40) .
14. Apply clean hydraulic oil to the components of the pump.
15. Install pump housing (27) to bearing cone (38) , swashplate (39) , and rotating group (40) .
Turn the pump body over 180 degrees and hold the components in the pump body.
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16. Position pump housing (27) on suitable cribbing. Position shaft (37) between the two blocks
of wood.
17. Install bearing cone (34) and shim (35) to shaft (37) . Apply clean hydraulic oil to the
bearing cone. Install O-ring seal (36) to pump housing (27) .
18. Apply Tooling (E) onto plunger (25) .
19. Position plunger (25) to the wear pad that is positioned on the swashplate. Tooling (E) will
hold plunger (25) in place. Install spring (26) on plunger (25) .
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20. Install the O-ring seals to plugs (33) . Install plugs (33) to pump head (22) . Tighten the
plugs to a torque of 45 ± 5 N·m (33 ± 4 lb ft).
21. Install locating pin (29) to pump head (22) . Apply Tooling (F) onto the threads on piston
guide (30) and plunger guide (32) . Install the piston guide and plunger guide into pump
head (22) and tighten to a torque of 80 N·m (60 lb ft). Apply Tooling (E) onto guide (32) .
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22. Apply Tooling (E) onto the side of plate (23) that has Slot (X) . Slot (X) will be positioned
over locating pin (29) when plate (23) is installed to the pump head.
23. Install plate (23) to pump head (22) . Install four O-ring seals (28) to pump head (22) .
Apply Tooling (E) onto piston (24) . Install piston (24) to guide (32) .
injury.
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24. Install pump head (22) , plate (23) , piston (24) , plunger (25) , and spring (26) as a unit to
pump housing (27) . Remember to align the marks that were applied to the mating
components.
25. Use two people in order to maneuver plunger (25) into spring (26) . Position piston (24) to
the wear pad that is positioned on the swashplate. Tooling (E) will hold the piston in place.
26. When all of the components are aligned, pump head (22) should be positioned to pump
housing (27) .
injury.
27. Install bolts (21) that secure pump head (22) to the pump assembly. The head is under
spring tension. Install the bolts slowly. Tighten bolts (21) to a torque of 21 ± 5 N·m (16 ± 4
lb ft).
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28. Install washer (5) and plug (4) into housing (2) .
29. Install washer (14) and plug (13) into housing (2) .
30. Install spool (6) , retainer (7) , spring (8) , spring (9) , and seat (10) .
31. Install O-ring seal (12) and plug (11) .
32. Install spool (15) , retainer (16) , spring (17) , and spring (18) .
33. Install plug (19) and O-ring seal (20) .
34. Install O-ring seals (3) and screw (4A) .
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35. Install valve (2) and bolts (1) .
36. Fill the pump with hydraulic oil before installing the pump to the machine.
End By: Install the piston pump (cushion-hitch). Refer to Disassembly and Assembly, "Piston
Pump (Cushion-Hitch) - Install".
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Caterpillar Cat 623G Wheel Scraper (Prefix CEW) Service Repair Manual Instant Download.pdf

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Caterpillar Cat 623G Wheel Scraper (Prefix CEW) Service Repair Manual Instant Download.pdf