Caterpillar Cat 621H WHEEL TRACTOR (Prefix NYY) Service Repair Manual Instant Download.pdf

Service Repair Manual
Models
621H WHEEL TRACTOR

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Product: WHEEL TRACTOR
Model: 621H WHEEL TRACTOR NYY
Configuration: 621H OEM Wheel Tractor NYY00001-UP (MACHINE) POWERED BY C13 Engine
Disassembly and Assembly
621H, 623H and 627H
Wheel Tractor-Scrapers Power Train
Media Number -KENR9488-01 Publication Date -01/06/2013 Date Updated -01/07/2013
i04577911
Transmission Planetary - Disassemble - Tractor
SMCS - 3030-015
Disassembly Procedure
Start By:
A. Separate the transfer gears from the transmission.
B. Remove the transmission hydraulic control valve.
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-7407 Eyebolt 2
B FT-0833 Clamp 2
C 2P-8312 Retaining Ring Pliers 1
D FT-1335 Transmission Fixture 1
E 1P-0520 Driver Gp 1
F 1P-2420 Transmission Repair Stand 2
G 1P-7405 Eyebolt 2
H 3/8 -16 by 2 in Forcing Bolts 4
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Illustration 1 g02607496
1. Install Tooling (A) and a suitable lifting device onto transmission assembly (1) . Position
transmission assembly (1) onto Tooling (F) . The weight of transmission assembly (1) is
approximately 703 kg (1550 lb).
2. Remove bolts (2) and the washers that secure the transmission assembly to transmission
housing (3) . Remove the transmission assembly from transmission housing (3) . Position
the transmission assembly onto two suitable blocks. Remove Tooling (A) .
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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.
3. Remove bolts (4) and the washers from clutch housing (5) .
4. Use Tooling (B) in order to hold the piston into clutch housing (5) . Install Tooling (A) and
a suitable lifting device onto clutch housing (5) . Remove clutch housing (5) from the
transmission assembly. The weight of clutch housing (5) is approximately 27 kg (60 lb).
Remove Tooling (A) and (B) .
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5. Remove piston (6) from clutch housing (5) . Remove seal ring (7) from piston (6) and from
clutch housing (5) .
Note: Friction discs and clutch plates that are removed from each clutch housing should be
kept with the correct clutch housing. Mixing the clutch plates and friction discs may cause
improper operation of the transmission or damage to the transmission.
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6. Remove springs (8) , dowels (9) , friction discs (10) , and clutch plates (11) from clutch
housing (12) .
7. Remove ring gear (13) from clutch housing (12) .
a suitable lifting device onto clutch housing (12) . Remove clutch housing (12) from
housing assembly (14) . The weight of clutch housing (23) is approximately 27 kg (60 lb).
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9. Remove piston (15) from clutch housing (12) . Remove a seal ring (16) from piston (15) and
from clutch housing (12) .
10. Remove springs (17) , dowels (18) , friction discs (19) , and clutch plates (20) from housing
assembly (14) .
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11. Remove retaining ring (21A) and adapter drive (22A) . Remove retaining ring (21) from
shaft (22) .
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12. Install Tooling (G) and a suitable lifting device onto carrier assembly (23) . Remove carrier
assembly (23) from housing assembly (14) . Remove Tooling (G) . The weight of the carrier
assembly is approximately 34 kg (75 lb).
13. Remove bolts (24) and oil slinger (25) from carrier assembly (23) . Remove bearing (26)
from carrier assembly (23) .
14. Use a hammer and a punch in order to push pin (27) into shaft (28) .
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15. Remove shaft (28) , thrust discs 29, and () planetary gears (30) from carrier assembly (23) .
Remove pin (27) from shaft (28) .
16. Remove bearings (31) from planetary gear (30) .
17. Repeat Steps 14, 15, and 16 in order to remove the remaining three shaft assemblies.
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19. Remove shaft (33) , thrust discs 34, and () gear (35) from carrier assembly (23) . Remove
tube (36) from shaft (33) . Remove pin (32) from shaft (33) .
20. Remove bearings (37) and spacer (38) from gear (35) .
21. Repeat Steps 18, 19, and 20 in order to remove the remaining three shaft assemblies from
the carrier assembly.
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22. Remove bolts (39) and plates (40) from clutch housing (41) . Remove ring gear (42) from
clutch housing (41) .
23. Remove bolts (43) that secure clutch housing (41) to housing assembly (14) .
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a suitable lifting device onto clutch housing (41) . Remove clutch housing (41) from
housing assembly (14) . The weight of clutch housing (41) is approximately 27 kg (60 lb).
25. Remove piston (44) from clutch housing (41) . Remove seal ring (45) from piston (44) and
from clutch housing (41) .
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26. Remove springs (46) , friction discs (47) , and clutch plate (48) from housing assembly
(14) .
27. Remove ring gear (49) from housing assembly (14) . Remove plate assembly (50) from
housing assembly (14) .
28. Remove retaining ring (51) from shaft (22) . Remove sun gear (52) and sun gear (53) from
shaft (22) .
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29. Remove bolts (54) and the washers in order to remove carrier assembly (55) from housing
assembly (14) .
30. Install Tooling (G) and a suitable lifting device onto carrier assembly (55) . Remove carrier
assembly (55) from housing assembly (14) . The weight of carrier assembly (55) is
approximately 14 kg (30 lb). Remove Tooling (G) .
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32. Remove shaft (57) , two thrust discs (58) , and gear (59) from carrier assembly (55) .
Remove pin (56) from shaft (57) .
33. Remove bearing (60) from gear (59) .
34. Follow Steps 31, 32, and 33 in order to remove the remaining two shaft assemblies from the
carrier assembly.
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35. Remove springs (61) , spring assemblies (62) , friction discs (63) , and clutch plate (64)
from housing assembly (65) . Remove reaction dowels (66) from housing assembly (65) .
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36. Remove spring assemblies (67) and lock plates (68) from housing assembly (65) .
37. Remove coupling (69) and gear (70) as one unit from housing assembly (65) .
38. Remove seal rings (71) from gear (70) .
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39. Remove piston (72) from housing assembly (65) . Remove seal ring (73) from piston (72) .
40. Use Tooling (C) in order to remove retaining ring (74) from shaft (22) .
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41. Remove metal seal ring (75) and retaining ring (76) from shaft (22) . Remove shaft (22)
from housing assembly (14) .
42. Install two Tooling (G) and a suitable lifting device onto housing assembly (65) . Remove
housing assembly (65) and balance piston (77) as one unit from housing assembly (14) .
Remove Tooling (G) .
43. Separate balance piston (77) from housing assembly (65) . Remove O-ring seal (78) from
housing assembly (65) .
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44. Remove seal ring (79) from housing assembly (65) . Remove retaining ring (80) and bearing
(81) from housing assembly (65) .
45. Use a suitable lifting device in order to turn over the housing assembly. Position the housing
assembly onto suitable blocks, as shown. The weight of housing assembly (84) is
approximately 61 kg (135 lb). Remove bolts (82) and the washers that secure clutch housing
(83) to manifold (84) .
Note: Manifold (84) is a component of housing assembly (14) . Previous text refers to
manifold (84) and housing assembly (14) as identical components.
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46. Use Tooling (B) to secure the clutch piston to clutch housing (83) . Install Tooling (A) and a
suitable lifting device to clutch housing (83) . Remove clutch housing (83) from manifold
(84) . The weight of clutch housing (83) is approximately 14 kg (30 lb). Remove Tooling
(A) and Tooling (B) .
47. Remove clutch piston (85) from the clutch housing. Remove seal rings (86) from clutch
piston (85) .
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48. Remove reaction dowels (87) , springs (88) , friction discs (89) , and clutch plates (90) from
manifold (84) .
Note: Be aware of location of springs for assembly purposes.
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49. Remove bolts (91) that secure gear assembly (92) to retainer plate (95) . Remove gear
assembly (92) from manifold (84) .
50. Remove retaining ring (93) from bearing cage assembly (94) .
51. Install Tooling (H) into retainer plate (95) . Tighten Tooling (H) evenly until retainer plate
(95) is separated from bearing cage assembly (94) . Remove Tooling (H) . Remove retainer
plate (95) and bearing (96) from bearing cage assembly (94) .
52. Remove bolts (97) that secure bearing cage assembly (94) and the plates to manifold (84) .
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53. Install Tooling (H) into bearing cage assembly (94) . Tighten Tooling (H) evenly until
bearing cage assembly (94) is separated from manifold (84) . Remove Tooling (H) .
Remove bearing cage assembly (94) from manifold (84) .
54. Remove two metal seal rings (98) from bearing cage assembly (94) .
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55. Remove sleeve bearing (99) from bearing cage assembly (94) .
56. Remove bolts (100) that secure the transmission assembly and the torque converter
assembly to the transmission case.
57. Install Tooling (A) and a suitable lifting device to the transmission assembly. Remove the
transmission assembly and the torque converter assembly from the transmission case as one
unit. Remove Tooling (A) . The weight of the transmission assembly and the torque
converter assembly is approximately 218 kg (480 lb).
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58. Place Tooling (D) on suitable blocks. Place the transmission assembly and torque converter
assembly on Tooling (D) and the suitable blocks, as shown.
59. Remove bolts (101) and the washers that secure carrier assembly (102) to balance piston
(103) .
60. Install Tooling (A) and a suitable lifting device to carrier assembly (102) . Remove carrier
assembly (102) from balance piston (103) . The weight of carrier assembly (102) is
approximately 28 kg (62 lb). Remove Tooling (A) .
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61. Remove bolts (104) and thrust plate (105) from carrier assembly (102) . Use a hammer and
a punch in order to push pin (106) (not shown) into shaft (107) .
62. Remove shaft (107) , thrust discs (108) , and planetary gear (109) from carrier assembly
(102) . Remove bearing (110) from planetary gear (109) . Remove pin (106) from shaft
(107) .
63. Repeat Steps 61 and 62 for the two remaining shaft assemblies.
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64. Remove spring assemblies (111) , reaction dowels (112) , friction discs (113) , and clutch
plate (114) from balance piston (103) .
65. Remove the ten springs that are located under clutch plate (114) .
66. Remove plate assembly (115) and plates (116) from balance piston (103) . Remove ring
gear (117) from clutch housing (103) .
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67. If necessary, remove the five rivets and the two thrust washers from the ring gear assembly.
68. Remove clutch piston (118) from balance piston (103) . Remove seal ring (119) from clutch
piston (118) .
69. Remove retaining ring (120) from sun gear (121) . Remove sun gear (121) from shaft (122) .
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70. Remove retaining ring (123) from housing assembly (124) . Refer to Illustration 65 in order
to view the housing assembly.
71. Install Tooling (A) and a suitable lifting device onto balance piston (103) . Remove balance
piston (103) and the carrier assembly from housing assembly (124) as a unit. Remove
Tooling (A) . The weight of the clutch housing (103) and the carrier assembly is
approximately 41 kg (90 lb).
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72. Remove balance piston (103) from carrier assembly (125) . Remove O-ring seals (126) and
(127) from carrier assembly (125) . Remove seal ring (128) from carrier assembly (125) .
73. Turn over the carrier assembly. For assembly purposes, mark a line across the separation
between bearing cage (129) and carrier assembly (125) . Remove bolts (130) and the locks
that secure bearing cage (129) to carrier assembly (125) .
74. Install Tooling (H) into bearing cage (129) . Tighten Tooling (H) evenly until bearing cage
(129) separates from carrier assembly (125) . Remove Tooling (H) . Remove bearing cage
(129) from carrier assembly (126) .
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75. Remove O-ring seals (131) from bearing cage (129) .
76. Remove metal seal ring (132) from bearing cage (129) . Use Tooling (E) and a hammer to
remove bearing (133) from bearing cage (129) .
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78. Remove shaft (135) , thrust discs (136) , and planetary gear (137) from carrier assembly
(126) . Remove bearing (138) from planetary gear (137) . Remove pin (134) from shaft
(135) .
79. Repeat Steps 77 and 78 for the two remaining shaft assemblies.
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80. Remove bolts (139) and the washers that secure front-end plate assembly (140) to housing
assembly (124) . Remove front-end plate assembly (140) from housing assembly (124) .
81. Remove springs (141) and reaction dowels (142) from housing assembly (124) .
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82. Remove friction discs (143) and clutch plate (144) from housing assembly (124) . Remove
ring gear (145) from housing assembly (124) .
83. Remove clutch piston (146) from housing assembly (124) . Remove seal ring (147) from
clutch piston (146) . Remove seal ring (148) from housing assembly (124) .
84. Remove nuts (149) that secure housing assembly (124) to the torque converter.
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85. Install Tooling (H) into manifold assembly (150) . Tighten Tooling (H) until manifold
assembly (150) separates from housing assembly (124) . Remove manifold assembly (150)
from housing assembly (124) . Remove Tooling (H) .
86. Remove bearing (151) from manifold assembly (150) . Remove seal rings (152) from
manifold assembly (150) .
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Caterpillar Cat 621H WHEEL TRACTOR (Prefix NYY) Service Repair Manual Instant Download.pdf

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Caterpillar Cat 621H WHEEL TRACTOR (Prefix NYY) Service Repair Manual Instant Download.pdf