3114, 3116 and 3126 MUI Engine Governors Caterpillar

Disassembly Procedure

Note: Inspect all parts of the governor upon disassembly. For information on the reusability of components in the governor, refer to the Guideline For Reusable Parts And Salvage Operations, SEBF8434, "3100 Governor Inspection and General Information for Mechanical Governor Groups Used in 3114, 3116, and 3126 Engines Equipped with Mechanical Unit Injectors (MUI)". For information on cleaning the components in the governor, refer to the Cleaning Guide, SEBF8354, "Equipment And Chemical Recommendations Reference Manual".

Note: Refer to Chart A "Parts to be Replaced During Rebuild" in Guideline For Reusable Parts And Salvage Operations, SEBF8434 for a list of components that need to be replaced during a governor rebuild. It is not necessary to replace the components in Chart A "Parts to be Replaced During Rebuild" if the governor is in the shop for a bench test or for minor repair.

Note: Early Type I Governors had limited production until 1991. The early Type I Governors may be inspected and perhaps reconditioned. However, some of the internal components are no longer serviced or the internal components may only be serviced by larger assemblies. When you recondition a Type I Governor, it may be necessary to replace the governor. If extensive repair work is necessary, a Type I Governor can be replaced with a Type IV Governor.

Illustration 1	g00521797
Typical Governor (1) Bolt (2) Orifice for the dashpot (3) O-ring seal (4) Bolt (5) Cover (6) Cover assembly (7) O-ring seal (8) Shims (9) Rear spring seat (10) Retaining ring (11) Spacer (12) Piston assembly for the dashpot (13) Shims for the high idle governor (if equipped) (14) Spring pair (15) Spring seat assembly

1. Mount the drive gear end of the governor on the 1U-7307 Governor Repair Fixture (Tool (A) ).

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Illustration 2	g00521798

2. Remove three bolts (4) .

3. Remove cover (5) .

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Illustration 3	g00521800

4. Remove O-ring seal (3) from cover (5). Inspect the O-ring seal for wear or damage. If the O-ring seal is worn or damaged, use a new part for replacement.

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Illustration 4	g00521801

5. Ensure that orifice (2) for the dashpot is not plugged. Also ensure that orifice (2) is tight in the casting.

   Note: The orifice for the dashpot may be drilled directly into the governor rear housing or the orifice may be a fitting that is staked into the governor rear housing. Ensure that all orifice fittings are staked into the governor housing before reassembly.

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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.

6. Use the following procedure in order to remove cover assembly (6) .

   1. Hold cover assembly (6) in position and slowly loosen bolts (1) in order to release the spring force.

   2. Remove three bolts (1) from the cover assembly.

   3. Remove cover assembly (6) .

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Illustration 5	g00521802

7. Remove O-ring seal (7) from cover assembly (6). Inspect the O-ring seal for wear or damage. If the O-ring seal is worn or damaged, use a new part for replacement.

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Illustration 6	g00521803

8. Remove rear spring seat assembly (9) .

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Illustration 7	g00522509

9. Remove spacer (11). Remove shims (8) from governor spring seat (9), if equipped. inspect governor spring seat (9) for wear or damage.

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Illustration 8	g00522514

10. Remove shims (13) for the high idle governor, if equipped.

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Illustration 9	g00522516

11. Remove spring seat assembly (15) from the governor.

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Illustration 10	g00522517

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Illustration 11	g00522519

Note: Spring pair (14) can be removed by unscrewing the coils of the springs from spring seat assembly (15). Inspect the spring pair for wear or damage. Replace the spring pair as a spring group package only. The dashpot spring (if equipped) does not need to be replaced as part of the governor spring package.

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Illustration 12	g00522532

12. Remove six bolts (16) in order to separate governor rear housing (17) from governor front housing (18) .

Note: Steps 13 through 35 are for the disassembly of the governor front housing. Steps 36 through 56 are for the disassembly of the governor rear housing.

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Illustration 13	g00522534

13. Remove riser (19) from governor front housing (18) .

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Illustration 14	g00522535

14. Remove retaining ring (20), two races (21), bearing (23) and shims (22) from riser (19) .

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Illustration 15	g00522536

15. Remove four bolts and four washers (24) that hold the flyweights in position.

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Illustration 16	g00522537

16. Remove flyweights (25) .

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Illustration 17	g00522574

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Illustration 18	g00522576

17. Remove flyweight pin (26). Inspect the pin for wear or damage.

18. Remove flyweight (25) from flyweight toe (27). Inspect the flyweight and the flyweight toe for wear or damage. If the flyweight or the flyweight toe is damaged, use new parts for replacement.

    Note: Keep all parts of each flyweight together for assembly.

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Illustration 19	g00522577

19. Hold flyweight carrier (28) in order to prevent the flyweight carrier from rotating and remove eight carrier bolts (29) .

    Note: Upon assembly, do not reuse eight carrier bolts (29). Replace the used carrier bolts with new carrier bolts.

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Illustration 20	g00522581

20. Remove flyweight carrier (28) and riser shaft (30) from the governor front housing.

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Illustration 21	g00522582

21. Remove pin (31) from riser shaft (30). Remove riser shaft (30) from flyweight carrier (28). Inspect riser shaft (30) for wear or damage. If the riser shaft is worn or damaged, use a new part for replacement. Inspect pin (31) for wear or damage. If the pin is worn or damaged, use a new part for replacement.

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Illustration 22	g00522819

Note: Two types of shutoff assemblies are used. The first type was used on Types I, II, and III governors. The second type has a spring that is preloaded in the opposite direction. This is the bias spring.

22. Remove two bolts (32) and the washers.

23. Remove shutoff assembly (33). Inspect the shutoff assembly for wear or damage. If the shutoff assembly is worn or damaged, use new parts for replacement.

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Illustration 23	g00522821

24. If necessary, remove blade (34) and blade (36). Do not remove spring (35) .

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Illustration 24	g00522822

25. Remove spring (38) for the throttle lever from throttle shaft (37) .

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Illustration 25	g00522823

26. Remove retaining clip (39) from throttle shaft (37) .

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Illustration 26	g00522826

27. Remove spacer (43), spring (42), setscrew (41), and control lever (40) from throttle shaft (37) .

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Illustration 27	g00522898

28. Remove retaining clip (44) from throttle shaft (37) .

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Illustration 28	g00522900

29. Remove throttle shaft (37) from the governor front housing. Inspect the throttle shaft for wear or damage. If the throttle shaft is worn or damaged, use a new part for replacement.

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Illustration 29	g00522902

30. Inspect throttle shaft seal (45) carefully for wear or damage. If the throttle shaft seal is worn or damaged, use a new part for replacement.

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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.

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Illustration 30	g00522904

31. Use the following procedure in order to remove cover assembly (47) .

    1. Hold cover assembly (47) in position and slowly loosen bolts (46) in order to release the spring force.

    2. Remove three bolts (46) and cover (47) .

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Illustration 31	g00522905

32. Remove spring (48) and O-ring (49). Inspect the O-ring for wear or damage. If the O-ring is worn or damaged, use a new part for replacement.

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Illustration 32	g00522950

33. Remove sleeve assembly (50) and tappet assembly (51) from the governor front housing.

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Illustration 33	g00522951

34. Remove piston (52) from sleeve assembly (50). Inspect the condition of piston (52) and sleeve assembly (50). If the piston or the sleeve assembly are worn or damaged, use new parts for replacement.

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Illustration 34	g00522952

35. Remove lower O-ring seal (53) from the fuel transfer pump housing. Check the O-ring seal for wear or damage. If the O-ring seal is worn or damaged, use a new part for replacement.

    Note: Remove the governor front housing from the 1U-7307 Governor Repair Fixture (Tool (A) ).

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Illustration 35	g00522953

36. Install three legs (G) on the 1U-7307 Governor Repair Fixture (Tool (A) ). Mount the governor rear housing on the three legs.

37. Remove seal (54) from the governor rear housing. Inspect the seal for damage. If the seal is damaged, use a new part for replacement.

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Illustration 36	g00522954

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NOTICE
The position of the bearing block will affect the output of the fuel rack. If the bearing block assembly is positioned too close to the riser lever, high idle may not be reached. If the bearing block assembly is positioned too far from the riser lever, fuel shutoff may not be obtained.

Note: Use a scribe to mark the location of the bearing block on the aluminum housing near the hole for the fuel shutoff solenoid. Scribe marks (X) should indicate the vertical position of the bearing block and the horizontal position of the bearing block. Scribe the marks close to the bearing block.

38. Remove two bolts (55) and the washers. Remove bearing block (56) .

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Illustration 37	g00523003

39. Use Tool (B) to remove retaining ring (58). Loosen bolt (57). Remove riser lever (59) from bearing block assembly (56) .

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Illustration 38	g00523005

40. Remove bearing block assembly (56) from pivot shaft (60) .

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Illustration 39	g00523007

41. Remove adjuster (63) for the torque cam from pivot shaft (60). Remove torsion spring (62) from pivot shaft (60). Inspect the condition of the parts on pivot shaft (60). If any of the parts are worn or damaged, use new parts for replacement.

42. Remove fulcrum lever (61) from pivot shaft (60). Remove the spring from the end of pivot shaft (60) .

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Illustration 40	g00523008

43. Push limit sleeve (66) and control sleeve (64) toward each other and compress spring (65) in order to expose retaining clip (67). Remove retaining clip (67) from governor output servo (68). Inspect the parts of the servo assembly for wear or damage.

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Illustration 41	g00523033

44. Remove retaining ring (69) with Tool (C). Remove governor output servo assembly (68) by pulling out on the clevis.

Note: Limit sleeve (66), spring (65), and control sleeve (64) will come out of the governor housing when the governor output servo assembly is removed.

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Illustration 42	g00523034
Governor Output Servo (Earlier Style) (70) Sleeve (71) Servo piston (72) Servo Valve (73) Clevis (74) Spring pin (75) O-ring seal

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NOTICE
The servo could come apart during engine shutdown if you fail to replace the parts that are listed in Chart B "Parts Replacement Chart" in the Guideline For Reusable Parts And Salvage Operations, SEBF8434. The engine will not start if the servo comes apart.

45. Use the following procedure to disassemble the early style of governor output servo assembly.

    1. Slide sleeve (70) against servo piston (71) .
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    Illustration 43	g00523035
    (D) 1U-7606 Servo Block (E) 1U-7277 Pin Punch (73) Clevis

    2. Position the 1U-7606 Servo Block (Tool (D) ) on the side so the notch is facing upward. Place the governor output servo so the sleeve is in the recess of Tool (D). The clevis end of the governor output servo should be located on the side of Tool (D). Rotate the governor output servo assembly so spring pin (74) is facing upward. Use a 1U-7277 Pin Punch (Tool (E) ) to press spring pin (74) out of the clevis and the governor output servo.

    3. Remove clevis (73), sleeve (70) and servo valve (72). Remove O-ring seal (75). Check the O-ring seal for wear or damage. If the O-ring seal is worn or damaged, use a new part for replacement.

46. Inspect all parts for wear or damage. If the parts are worn or damaged, use new parts for replacement.

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Illustration 44	g00523041
Governor Output Servo (Later Style) (70) Sleeve (71) Servo piston (72) Servo Valve (73) Clevis (74) Spring pin (75) O-ring seal (76) Tolerance ring

47. Use the following procedure to disassemble the later style of governor output servo assembly.

    1. Slide sleeve (70) against servo piston (71) .
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    Illustration 45	g00523035
    (D) 1U-7606 Servo Block (E) 1U-7277 Pin Punch (73) Clevis

    2. Position Tool (D) on the side so the notch is facing upward. Place the governor output servo so the sleeve is in the recess of Tool (D). The clevis end of the governor output servo should be located on the side of Tool (D). Rotate the assembly so spring pin (74) is facing upward. Use Tool (E) to press spring pin (74) through both parts.
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    Illustration 46	g00523042
    (D) 1U-7606 Servo Block (F) 1U-7635 Clevis Driver (71) Servo piston (73) Clevis

    3. Position Tool (D) on the end so the notch end is facing upward. Hold the governor output servo so the clevis is pointing downward. Slide sleeve (70) down the clevis as far as possible. Do not force the sleeve. Slide the entire assembly into Tool (D) from the open side. Position the assembly so the flange with the large diameter on servo piston (71) rests on the top surface of Tool (D) .

    4. Slide the 1U-7635 Clevis Driver (Tool (F) ) over the end of servo valve (72). Position the driver so the end with the smaller diameter is against the shoulder of servo valve (72). Press against the end of the driver until clevis (73) is removed from the governor output servo.

    5. Remove sleeve (70), servo valve (72), O-ring seal (75) and tolerance ring (76) .

48. Inspect all parts for wear or damage. If the parts are worn or damaged, use new parts for replacement.

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Illustration 47	g00523192

49. Remove retaining clip (77) .

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Illustration 48	g00523193

50. Remove washer (79), limit lever assembly (78), and spring (80). Inspect the condition of limit lever (78) .

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Illustration 49	g00523194

51. Remove one bolt (83). Remove bracket (82) and fuel ratio control valve (81) .

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Illustration 50	g00523195

52. Remove fuel ratio control lever assembly (84). Do not remove shaft (85) from the governor front housing.

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Illustration 51	g00523196

53. Remove O-ring seal (86) from fuel ratio control valve (81). Check the O-ring seal for wear or damage. If the O-ring seal is worn or damaged, use a new part for replacement.

    Note: The fuel ratio control valve is not serviceable. Do not disassemble the fuel ratio control valve beyond this point.

    Note: The following steps are for the disassembly of the C spring on Type I governors.

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Illustration 52	g00523197

54. Remove bolt (87) and the sleeve assembly that holds cover (88) in position. Remove cover (88) .

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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.

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Illustration 53	g00523198

55. Remove C spring (89) carefully in order to avoid personal injury.

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Illustration 54	g00523199

56. Remove drive gear (90) .

    Note: Inspect the cam on the fuel transfer pump. If the cam has excessive wear, it will be necessary to replace the entire drive assembly.

    Note: Inspect all of the parts of the governor upon disassembly. For information on reusability of components in the governor, refer to Guideline For Reusable Parts And Salvage Operations, SEBF8434, "3100 Governor Inspection and General Information for Mechanical Governor Groups Used in 3114, 3116, and 3126 Engines Equipped with Mechanical Unit Injectors (MUI)".

    Note: For information on cleaning the components in the governor, refer to the Cleaning Guide, SEBF8354, "Equipment And Chemical Recommendations Reference Manual".