Caterpillar Cat 621H WHEEL TRACTOR (Prefix HKK) Service Repair Manual (HKK00001 and up).pdf

Shutdown SIS
Previous Screen
Product: WHEEL TRACTOR
Model: 621H WHEEL TRACTOR HKK
Configuration: 621H OEM Wheel Tractor HKK00001-UP (MACHINE) POWERED BY C13 Engine
Disassembly and Assembly
621H, 623H and 627H Wheel Tractor-Scrapers Power Train
Media Number -KENR8883-02 Publication Date -01/06/2013 Date Updated -01/07/2013
i04496349
Torque Converter - Disassemble - Tractor
SMCS - 3101-015
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 2P-8312 Retaining Ring Pliers 1
B 1P-0510 Driver Group 1
C 6L-7283 Bolts 2
Start By:
a. Remove the torque converter.
Illustration 1 g01052899
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https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...

1. Use Tooling (A) in order to remove retaining ring (1) from carriage support assembly (2).
Remove carriage support assembly (2) from hub (3). Use Tooling (B) and a suitable press in
order to remove the sleeve bearing from carriage support assembly (2).
2. Remove bolts (4) and the washers from torque converter impeller (5). Remove bolts (6), the
washers, and clamp plate (7) from impeller hub (8).
3. Install Tooling (C) in torque converter impeller (5). Use Tooling in order to remove torque
converter impeller (5) and impeller hub (8) from housing (9).
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4. Remove metal seal ring (10) from torque converter impeller (5). Remove impeller hub (8)
from torque converter impeller (5).
5. Remove thrust bearing (11) from carrier assembly (12).
6. Remove carrier assembly (12) and torque converter stator (13) as a unit from housing (9).
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7. Position carrier assembly (12) and torque converter stator (13), as shown. Use Tooling (A)
in order to remove retaining ring (14) from torque converter stator (13). Remove thrust race
(15) from torque converter stator (13).
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.
8. Remove freewheel rollers (16) and freewheel springs (17) from freewheel cam (18).
Remove torque converter stator (13) from carrier assembly (12).
9. Use Tooling (A) in order to remove retaining ring (19) from torque converter stator (13).
Remove side plate (20) from torque converter stator (13).
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10. Use Tooling (B) and a suitable press in order to remove freewheel cam (18) (not shown)
from torque converter stator (13).
11. Remove thrust bearing (21) from carrier assembly (12). Remove sleeve bearing (22) from
carrier assembly (12).
12. Remove torque converter turbine (23) and hub (3) as a unit from housing (9).
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13. Remove thrust bearing (24) and thrust race (25) from hub (3).
14. Position torque converter turbine (23), as shown. Remove thrust race (26) from hub (3). Put
an alignment mark on torque converter turbine (23) and hub (3) for installation purposes.
Remove bolts (27) from torque converter turbine (23).
15. Remove clamp ring (28) and torque converter turbine (23) from hub (3).
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16. Remove thrust bearing (29) and thrust race (30) from housing (9).
17. Remove bolts (31) and flange (32) from housing (9).
18. Remove sleeve bearing (33) from flange (32).
Copyright 1993 - 2021 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sat Mar 27 07:09:34 UTC+0800 2021
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Shutdown SIS
Previous Screen
i07459845
Torque Converter - Assemble - Tractor
SMCS - 3101-016
Assembly Procedure
Table 1
Required Tools
A 2P-8312 Retaining Ring Pliers 1
B 1P-0510 Driver Group 1
D 8T-5096 Dial Indicator Group 1
1. Use Tooling (B) and a suitable press to install sleeve bearing (33). Install sleeve bearing
(33) to flange (32).
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2. Install bolts (31) and flange (32) to housing (9). Tighten bolts (31) to a torque of
120 ± 15 N.m (89 ± 11 lb ft).
3. Install thrust race (30) and thrust bearing (29) to housing (9).
4. Install torque converter turbine (23) and clamp ring (28) to hub (3).
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5. Install bolts (27) to torque converter turbine (23). Tighten bolts (27) to a torque of
50 ± 7 N.m (37 ± 5 lb ft).
6. Install thrust race (25) and thrust bearing (24) to hub (3).
7. Install thrust race (26) to hub (3).
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8. Install torque converter turbine (23) and hub (3) as a unit to housing (9).
9. Use Tooling (B) and a suitable press to install sleeve bearing (22). Install sleeve bearing
(22) to carrier assembly (12).
10. Install thrust bearing (21) to carrier assembly (12).
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11. Install side plate (20) to torque converter stator (13). Use Tooling (A) to install retaining
ring (19). Install retaining ring (19) to torque converter stator (13).
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.
12. Use Tooling (B) and a suitable press to install freewheel cam (18). Install freewheel cam
(18) to torque converter stator (13).
13. Install torque converter stator (13) to carrier assembly (12). Install freewheel springs (17)
and freewheel rollers (16) to freewheel cam (18). Always install new freewheel springs (17)
and freewheel rollers (16). Install freewheel springs (17) with the maximum number of
loops in freewheel springs (17) to the outside of freewheel cam (18). Torque converter
stator (13) should turn freely in the counterclockwise direction. Torque converter stator (13)
should not turn freely in the clockwise direction.
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14. Install thrust race (15) to torque converter stator (13). Use Tooling (A) to install retaining
ring (14). Install retaining ring (14) to torque converter stator (13).
15. Install carrier assembly (12) and torque converter stator (13) as a unit to housing (9).
16. Install thrust bearing (11) to carrier assembly (12).
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17. Install impeller hub (8) to torque converter impeller (5). Install metal seal ring (10) to torque
converter impeller (5).
18. Install clamp plate (7), the washers, and bolts (6) to impeller hub (8). Tighten bolts (6) to a
torque of 50 ± 7 N.m (37 ± 5 lb ft).
19. Install bolts (4) and the washers to torque converter impeller (5). Tighten bolts (4) to a
torque of 50 ± 7 N.m (37 ± 5 lb ft).
20. Use Tooling (B) and a suitable press to install the sleeve bearing in carriage support
assembly (2). Install the sleeve bearing until the sleeve bearing is flush with the outside
machined surface of carriage support assembly (2).
21. Install carriage support assembly (2) to hub (3). Use Tooling (A) to install retaining ring (1).
Install retaining ring (1) to carriage support assembly (2).
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22. Install Tooling (D) to the torque converter, as shown. The edge of Tooling (D) must be in
contact with the edge of carrier assembly (12), as shown. Move hub (3) up and down with a
screwdriver. The end play of hub (3) must be 0.13 to 1.96 mm (0.005 to 0.077 inch).
End By:
a. Install the torque converter.
Sat Mar 27 07:10:30 UTC+0800 2021
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Shutdown SIS
Previous Screen
i04573776
Transfer Gears - Remove and Install - Tractor, Off Chassis
SMCS - 3159-010
Removal Procedure
Table 1
Required Tools
A 138-7574 Link Bracket 2
B 308-3471 Jack Stand Gp 1
Start By:
a. Remove the transmission, torque converter, and transfer gears.
b. Remove the speed sensor.
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1. Use Tooling (A) and a suitable lifting device to position transmission, torque converter, and
transfer gears (1) onto suitable cribbing and Tooling (B). The weight of transmission, torque
converter, and transfer gears (1) is approximately 1320 kg (2910 lb).
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2. Attach Tooling (A) and a suitable lifting device to transfer gears (2). The weight of transfer
gears (2) is approximately 340 kg (750 lb). Remove nuts (3) and the bolts. Separate transfer
gears (2) from transmission (4). Remove O-ring seals (5).
3. Remove O-ring seal (6).
Installation Procedure
1. Install transfer gears (2) in the reverse order of removal.
Sat Mar 27 07:11:26 UTC+0800 2021
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Shutdown SIS
Previous Screen
i04572074
Transfer Gears - Remove and Install - Tractor, In Chassis
SMCS - 3159-010
Removal Procedure
Table 1
Required Tools
A 138-7575 Link Bracket 1
B 138-7574 Link Bracket 1
C - 1/2 - 13 NC by 1.5 inch Bolts 2
Hot oil and components can cause personal injury.
Do not allow hot oil or components to contact skin.
1. Start the machine. Turn the tractor so that the tractor is at a right angle to the scraper.
2. Remove the power train guard (transmission).
3. Remove the drive shaft.
4. Remove the speed sensor.
5. Remove gear pump (steering).
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6. Remove piston pump (implement)
7. Remove the piston pump (elevator), if equipped.
8. Remove the transmission scavenge pump.
9. Disconnect clip (2) . Disconnect hose assemblies (3) and harness assembly (1) from filter
assembly (4).
10. Attach Tooling (A) and a suitable lifting device to filter assembly (4). The weight of filter
assembly (4) is approximately 36 kg (80 lb). Remove filter assembly (4).
11. Disconnect hose assemblies (5).
12. Remove hose assembly (8) and (11).
13. Remove tube assemblies (7) and (9).
14. Disconnect harness assembly (10) from transfer gears (6).
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15. Remove tube assembly (12).
16. Attach Tooling (A) and a suitable lifting device to transfer gears (6). The weight of transfer
gears (6) is approximately 318 kg (700 lb).
17. Remove bracket (14).
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18. Remove nuts (13) and the bolts that secure transfer gears (6) to the transmission case. Use
Tooling (C) to remove transfer gears (6). Remove transfer gears (6).
19. Remove O-ring seals (15).
20. Remove O-ring seal (16).
Installation Procedure
1. Install transfer gears (6) in the reverse order of removal.
Sat Mar 27 07:12:22 UTC+0800 2021
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Shutdown SIS
Previous Screen
i07460047
Transfer Gears - Disassemble - Tractor
SMCS - 3159-015
Disassembly Procedure
Table 1
Required Tools
A 439-3940 Bracket As 1
B
8B-7548 Push-Puller Tool Gp 1
8B-7551 Bearing Puller Gp 1
1P-0498 Drive Plate 1
C
5P-4170 Step Plate 1
1P-2321 Combination Puller 1
D
8B-7554 Bearing Cup Puller Gp 1
5P-4170 Step Plate 1
1P-0518 Drive Plate 1
E
8B-7560 Step Plate 1
5F-7345 Screw 1
8B-7554 Bearing Cup Puller Gp 1
F -
Bolts
3/8" - 16 NC by 3 inch
3
Start By:
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a. Remove the transfer gear case.
b. Remove the transmission oil filter base.
c. Remove the transmission scavenge pump.
d. Remove the transmission oil pump.
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.
1. Put identification marks on components for installation purposes.
2. Remove the bolts that secure bearing cage (1) to the transfer gear case. Use Tooling (F) to
separate bearing cage (1) from the transfer gear case.
3. Remove bearing cage (1) and shims (2) from the transfer gear case.
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5. Remove bearing cage (3) and shims (4) from the transfer gear case.
6. Remove gear assembly (5).
7. Remove tube (6) and gear assembly (7).
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8. Remove bearing cups (8) from the transfer gear case. Attach Tooling (A) and a suitable
lifting device onto the transfer gear case. The weight of the transfer gear case is
approximately 340 kg (750 lb). Turn over the transfer gear case. Remove Tooling (A).
10. Remove bearing cage (9), shims (10), and gear (11) from the transfer gear case.
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11. Remove bearing cup (12) from the transfer gear case. Attach Tooling (A) and a suitable
lifting device onto the transfer gear case. Turn over the transfer gear case.
12. Remove bolts (13) that secure bearing cage (14) to the transfer gear case. If necessary, rotate
the gear until the three threaded holes are visible in bearing cage (14). Install Tooling (F)
through gear (15) and into bearing cage (14). Tighten Tooling (F) evenly until bearing cage
(14) and gear (15) separate from the transfer gear case. Remove bearing cage (14) and gear
(15) as a unit from the transfer gear case.
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13. Remove retaining ring (16) from gear (15). Remove bearing (17) and bearing cage (14)
from gear (15).
14. Remove bearing (17) from bearing cage (14).
15. Remove bolts (19) and separate gear (20) from gear (11). Use Tooling (B) to remove
bearing cone (18). Remove bearing cone (18) from gear (11). Repeat the procedure for the
bearing cone on the opposite side of gear (11).
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16. Use Tooling (C) to remove bearing cone (21). Remove bearing cone (21) from gear (5).
Repeat the procedure for the bearing cone on the opposite side of gear (5).
18. Use Tooling (D) to remove bearing cup (23). Remove bearing cup (23) from bearing cage
(1). Remove O-ring seal (24) from bearing cage (1).
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19. Remove bearing cup (25) from bearing cage (9).
20. Use Tooling (E) to remove bearing cup (26). Remove bearing cup (26) from bearing cage
(3). Remove O-ring seal (27) from bearing cage (3).
21. Remove the bolt that secure cover (28). Use Tooling (F) to remove cover (28). Remove
cover (28).
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22. Remove the bolt that secure bearing cage (29). Use Tooling (F) to remove bearing cage (29)
and shims (30). Remove bearing cage (29) and shims (30).
23. Remove tube (31) and gear assembly (32).
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Caterpillar Cat 621H WHEEL TRACTOR (Prefix HKK) Service Repair Manual (HKK00001 and up).pdf

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Caterpillar Cat 621H WHEEL TRACTOR (Prefix HKK) Service Repair Manual (HKK00001 and up).pdf