Caterpillar Cat 120H Motor Grader (Prefix ALZ) Service Repair Manual Instant Download
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Service Repair Manual Models 120H M otor Grader
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(SEB... 1/37 Shutdown SIS Previous Screen Product: MOTOR GRADER Model: 120H MOTOR GRADER ALZ Configuration: 120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine Disassembly and Assembly 120H and 135H Motor Graders Power Train Media Number -RENR4160-05 Publication Date -01/04/2005 Date Updated -22/05/2017 i01967370 Transmission - Disassemble SMCS - 3002-015; 3030-015; 3159-015 Disassembly Procedure Table 1 Required Tools Tool Part Number Part Description Qty A 138-7575 Link Bracket 3 B 154-6181 Forcing Screw 2 C 6V-5221 Bolt 1 D 4C-8156 Fixture 1 E 6V-3918 Bolt 1 F 4C-8157 Lifting Fixture 2 G 1U-6405 Three Jaw Puller 1 H 1U-6341 Threaded Rod 1 J 5P-7970 Nut 1 K 9U-7479 Compressing Tube 1 L 5B-0637 High Idle Nut 1 5F-7353 Washer 1 1B-4207 Full Nut 2 5F-7369 Puller Leg 2 3H-0465 Push-Puller Plate 2 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(SEB... 2/37 5F-7366 Screw 1 5P-4808 Cap 2 1U-9895 Crossblock 1 9S-9152 Block 2 M 1B-4206 Nut 4 8B-7552 Forcing Bolt 2 N 1U-6343 Threaded Rod 1 P 6V-8149 Nut 1 Q 2P-8312 Pliers 1 1P-2326 Screw 1 1P-2325 Head 1 R 3H-0462 Bolt and Nut 4 8H-0709 Strap 4 5F-7373 Jaw 3 T 3E-3882 Eyebolt 1 Start By: a. Remove the transmission. Refer to Disassembly and Assembly, "Transmission - Remove" for the correct procedure. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
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120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(SEB... 3/37 Illustration 1 g00997069 1. Install Tooling (A) on transmission control valve (1). Attach a suitable lifting device to Tooling (A). 2. Remove bolts (2) and remove transmission control valve (1). The weight of transmission control valve (1) is approximately 30 kg (65 lb). 3. Remove temperature sensor (3). Remove tube assembly (4). Remove hose assemblies (5). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(SEB... 4/37 Illustration 2 g01021534 4. Remove hose assembly (8) and remove intermediate sensors (9) and (6). 5. Attach a suitable lifting device to pump (11). Remove bolts (10). Remove pump (11). The weight of pump (11) is approximately 25 kg (55 lb). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(SEB... 5/37 Illustration 3 g00997084 6. Remove bolt (12) and yoke (13). Remove bolts (14) and brake (15). Use two people to remove brake (15). The weight of brake (15) is approximately 34 kg (75 lb). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(SEB... 6/37 Illustration 4 g00997086 7. Remove O-ring seal (14A). Illustration 5 g00997489 8. Remove plates (15A), disc (15B), hub (15C), and dowels (15D). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(SEB... 7/37 Illustration 6 g00997087 9. Remove cover (16). Remove output speed sensors (17). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(SEB... 8/37 Illustration 7 g00997091 10. Remove input sensor (18). Remove bolts (20A). Remove plate assembly (20) and harness assembly (19). Illustration 8 g00997251 11. Place transmission (21) level on the floor. 12. Remove bolts (22) , the four covers, and the O-ring seals from transmission case assembly (23). 13. Remove bolts (24) from the transmission case assembly (23). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(SEB... 9/37 Illustration 9 g00997252 Note: Identify the location of seal carrier (25) in the transmission case assembly (23) for assembly purposes. 14. Remove bolts (26) from seal carrier (25). 15. Install Tooling (A) (not shown) in seal carrier (25). Remove seal carrier (25) and the three ring seals from the transmission case assembly bore (27). 16. Repeat Step 14 through Step 15 on the three remaining seal carriers (25). Illustration 10 g00997253 17. Remove seal rings (29) from seal carrier (25). 18. Remove seals (28) from seal carrier (25). 19. Remove spring pin (30) from seal carrier (25). 20. Repeat Step 17 and Step 19 for the remaining three seal carriers (25). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(S... 10/37 Illustration 11 g00997255 21. Install Tooling (B) in the transmission case assembly (23). Tighten Tooling (B) evenly to separate transmission case assembly (23) from transmission cover assembly (31). 22. Install Tooling (A) to transmission case assembly (23). Attach a suitable lifting device to Tooling (A). Slowly raise the transmission case assembly (23) from the transmission cover assembly (31). Be careful not to bind the transmission case assembly (23) during separation. Illustration 12 g01022248 23. Remove bolts (32) from tube assembly (33). Remove tube assembly (33) from the transmission cover assembly (31). 24. Remove the O-ring seal from tube assembly (33). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(S... 11/37 Illustration 13 g00997257 Note: First/Third shaft assembly (34) and High/Low shaft assembly (35) must be removed together. 25. Install Tooling (D) on First/Third shaft assembly (34) and High/Low shaft assembly (35). Use Tooling (C) and Tooling (E) in order to hold Tooling (D) on First/Third shaft assembly (34) and High/Low shaft assembly (35), as shown. First/Third shaft assembly (34) and High/Low shaft assembly (35) must be removed together. 26. Attach a suitable lifting device to Tooling (D). Carefully remove First/Third shaft assembly (34) and High/Low shaft assembly (35) from the transmission cover assembly (31). The weight of the two shaft assemblies is approximately 177 kg (390 lb). Illustration 14 g00997258 27. Place First/Third shaft assembly (34) and High/Low shaft assembly (35) on Tooling (F) or on blocks and remove Tooling (D). Carefully separate First/Third shaft assembly (34) and High/Low shaft assembly (35). The weight of each shaft assembly is approximately 89 kg (195 lb). Illustration 15 g00997259 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(S... 12/37 Illustration 16 g00997261 Note: Place High/Low shaft (35) in a modified work bench or on blocks. Modify a substantial workbench by cutting a 116.0 2.0 mm (4.60 0.08 inch) clearance hole in the top of the bench. Illustration 17 g00997262 Illustration 18 g00997263 Note: Do not attach Tooling (G) to rotor (37). If pressure is applied to rotor (37) with Tooling (G), rotor (37) will brake. Attach Tooling (G) to gear assembly (38). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(S... 13/37 28. With High/Low shaft assembly (35) on the modified work bench or on blocks, use Tooling (G) in order to remove race and bearing (36), rotor (37), gear assembly (38), and two sleeve bearings (not shown) from High/Low shaft assembly (35). Press fit bearing (36) and rotor (37) on High/Low shaft assembly (35). 29. Remove bearing (36), rotor (37), thrust disc (39), and gear assembly (38) from High/Low shaft assembly (35). Attach Tooling (G) to gear assembly (38). Do not attach Tooling (G) to rotor (37). Illustration 19 g00997265 30. Remove thrust disc (40) and the washer from High/Low shaft assembly (35). Illustration 20 g00997266 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. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(S... 14/37 31. Install Tooling (H) and Tooling (K) on High/Low shaft assembly (35) and clutch assembly (41). Tighten Tooling (J) on Tooling (H) (not shown) in order to compress clutch assembly (41). Remove two half rings (42) and two lock rings (43) from the High/Low shaft assembly (35). 32. Carefully loosen Tooling (J) on Tooling (H) in order to relieve pressure from clutch assembly (41). Remove Tooling (K) and Tooling (H) from High/Low shaft assembly (35) and clutch assembly (41). The clutch assembly (41) is made up of five clutch plates, six friction discs, and the hub assembly. Identify the position of the clutch assembly (41) for assembly purposes. Illustration 21 g00997267 33. Remove wave spring (45) from High/Low shaft assembly (35). 34. Remove piston (44) from High/Low shaft assembly (35). Illustration 22 g00997268 35. Remove seal extension ring (47) and seal ring (46) from piston (42). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(S... 15/37 Illustration 23 g00997270 36. Position High/Low shaft assembly (35), as shown. Place High/Low shaft (35) in the modified work bench, or on blocks. The weight of High/Low shaft assembly (35) is approximately 50 kg (110 lb). 37. Install Tooling (L) and Tooling (M) on High/Low shaft assembly (35) and inner bearing (48). Remove inner bearing (48) from High/Low shaft assembly (35). Remove two thrust discs (49), two bearing sleeves, and gear assembly (50) from High/Low shaft assembly (35). Illustration 24 g00997273 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. 38. Remove thrust disc (51) and the washer from High/Low shaft assembly (35). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(S... 16/37 Illustration 25 g00997275 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: Tooling (K) is the old style tool that is now modified. Tooling (K) (new style tool) works without being modified. Tooling (K) may need to be modified so the hole in the top of the tube will have clearance for Tooling (N). 39. Install Tooling (N) and Tooling (K) on High/Low shaft assembly (35) and clutch assembly (52). Tighten Tooling (P) on Tooling (N) in order to compress clutch assembly (52). Remove two half rings (53) and two lock rings (54) from the High/Low shaft assembly (35). 40. Carefully loosen Tooling (P) on Tooling (N) in order to relieve pressure from clutch assembly (52). Remove Tooling (K) and Tooling (N) from High/Low shaft assembly (35) and clutch assembly (52). The clutch assembly (52) is made up of eight clutch plates, seven friction discs, and the hub assembly. Identify the position of the clutch assembly (52) for assembly purposes. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(S... 17/37 Illustration 26 g00997276 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: Tooling (K) is the old style tool that must be modified. Tooling (K) (new style tool) works without being modified. Tooling (K) may need to be modified so the hole in the top of the tube will have clearance for Tooling (N). 41. Install Tooling (N) and Tooling (K) on High/Low shaft assembly (35) and balance piston (55). Tighten Tooling (P) on Tooling (N) in order to compress balance piston (55). 42. Use Tooling (Q) in order to remove retaining ring (56) from High/Low shaft assembly (35). 43. Carefully loosen Tooling (P) on Tooling (N) in order to relieve pressure from balance piston (55). Remove Tooling (K) and Tooling (N) in order to relieve pressure from High/Low shaft assembly (35) and balance piston (55). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(S... 18/37 Illustration 27 g00997277 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. 44. Remove balance piston (55) and seal extension ring (57) from High/Low shaft assembly (35). 45. Remove fifteen springs (58) from piston (59). 46. Remove piston (59), the seal extension ring (not shown), and a ring seal (not shown) from High/Low shaft assembly (35). Illustration 28 g00997278 47. Remove seal ring (60) and seal extension ring (61) from piston (59). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(S... 19/37 Illustration 29 g00997279 48. Place First/Third shaft assembly (34) on the modified work bench or on blocks. Use Tooling (F) in order to remove race and bearing (62), thrust disc (not shown), and gear assembly (63) from First/Third shaft assembly (34). Illustration 30 g00997280 49. Remove thrust disc (64) and gear assembly (65) from First/Third shaft assembly (34). Illustration 31 g00997283 50. Remove the sleeve bearing (not shown), thrust disc (66), and washer (67) from First/Third shaft assembly (34). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(S... 20/37 Illustration 32 g00997284 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. 51. Install Tooling (H) and Tooling (K) on First/Third shaft assembly (34) and clutch assembly (68). Tighten Tooling (K) on Tooling (H) in order to compress clutch assembly (68). Remove two half rings (69) and two lock rings (70) from First/Third shaft assembly (34). 52. Carefully loosen Tooling (J) on Tooling (H) in order to relieve pressure from clutch assembly (68). Remove Tooling (K) and Tooling (H) from First/Third shaft assembly (34) and clutch assembly (68). As you remove clutch assembly (68) from First/Third shaft assembly (34), identify the positions of the five clutch plates, the six friction disc, and the hub assembly for assembly purposes. Illustration 33 g00997296 53. Remove wave spring (71) from First/Third shaft assembly (34). 54. Remove piston (72) from First/Third shaft assembly (34). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
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120H Motor Grader ALZ00001-UP (MACHINE) POWERED BY 3126B Engine(S... 21/37 Illustration 34 g01022249 55. Remove seal extension ring (73) and seal ring (74) from piston (72). Illustration 35 g00997299 56. Position First/Third shaft assembly (34), as shown. Place First/Third shaft assembly (34) in the modified work bench, or on blocks. The weight of First/Third shaft assembly (34) is approximately 55 kg (120 lb). 57. Remove the seal ring (not shown) from First/Third shaft assembly (34). 58. Use Tooling (R) in order to remove inner bearing (75), thrust disc (not shown), gear (76), and thrust disc (not shown). 59. Remove gear assembly (77), the bearing sleeve (not shown), the thrust disc, and the washer (not shown) from First/Third shaft assembly (34). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisw... 2020/3/3
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