Disassembly Procedure
| Required Tools | |||
|---|---|---|---|
| Tool | Part Number | Part Description | Qty |
| A | 1U-7307 | Governor Repair Fixture (1) | 1 |
| B | 1P-1855 | Retaining Ring Pliers | 1 |
| C | 1P-1857 | Retaining Ring Pliers | 1 |
| D | 1U-7606 | Servo Block (1) | 1 |
| E | 1U-7277 | Pin Punch | 1 |
| F | 1U-7635 | Clevis Driver (1) | 1 |
| ( 1 ) | Part of former 1U-9088 Governor Tool Group |
| NOTICE |
|---|
Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life. |
| 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 Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
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 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: Refer to Chart B "Parts Replacement Chart" in Guideline For Reusable Parts And Salvage Operations, SEBF8434 for a list of components that need to be replaced when the servo assembly is serviced.
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| 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 | |
- Mount the drive gear end of the governor on the 1U-7307 Governor Repair Fixture (Tool (A) ).
- Remove three bolts (4) and cover (5) from the governor.
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| Illustration 2 | g00521798 |
- Remove O-ring seal (3) from cover (5). Inspect the O-ring seal for wear or for damage. If the O-ring seal is worn or damaged, use a new part for replacement.
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| Illustration 3 | g00521800 |
- 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 housing or the orifice may be a fitting that is staked into the governor housing. Ensure that all orifice fittings are staked into the governor housing before reassembly.
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| Illustration 4 | g00521801 |
- Use the following procedure in order to remove cover assembly (6) .
- Hold cover assembly (6) in position and slowly loosen bolts (1) in order to release the spring force.
- Remove three bolts (1) from the cover assembly.
- Remove cover assembly (6) .
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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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- Remove O-ring seal (7) from cover assembly (6). Inspect the O-ring seal for wear or for damage. If the O-ring seal is worn or damaged, use a new part for replacement.
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| Illustration 5 | g00521802 |
- Remove governor spring seat (9) from the riser shaft.
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| Illustration 6 | g00521803 |
- Remove spacer (11). Remove shims (8) from governor spring seat (9), if equipped.
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| Illustration 7 | g00522509 |
- Remove shims (13) for the high idle governor, if equipped.
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| Illustration 8 | g00522514 |
- Remove spring seat assembly (15) from the governor.
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| Illustration 9 | g00522516 |
- Remove six bolts (16) in order to separate governor rear housing (17) from governor front housing (18) .
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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 springs for wear or for 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 |
- Remove riser (19) from governor front housing (18) .
Note: Steps 12 through 35 are for the disassembly of the governor front housing. Steps 36 through 61 are for the disassembly of the governor rear housing.
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| Illustration 13 | g00522534 |
- Remove retaining ring (20), two races (21), bearing (23) and shims (22) from riser (19) .
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| Illustration 14 | g00522535 |
- Remove four bolts and four washers (24) that hold the flyweights in position.
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| Illustration 15 | g00522536 |
- Remove flyweights (25) .
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| Illustration 16 | g00522537 |
- Remove flyweight pin (26). Inspect the flyweight pin for wear or for damage.
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| Illustration 17 | g00522574 |
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| Illustration 18 | g00522576 |
- Remove flyweight (25) from flyweight toe (27). Inspect the flyweight toe for wear or for damage.
Note: Keep all parts of each flyweight together.
- 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 19 | g00522577 |
- Remove flyweight carrier (28) and riser shaft (30) .
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| Illustration 20 | g00522581 |
- Remove pin (31) from riser shaft (30). Inspect pin (31) for wear or for damage. Remove riser shaft (30) from flyweight carrier (28). Inspect riser shaft (30) for wear or for damage. If the riser shaft or the pin are worn or damaged, use new parts for replacement.
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| Illustration 21 | g00522582 |
- Remove two bolts (32) .
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| Illustration 22 | g00522819 |
Note: Two types of shutoff assemblies are used. The first type of shutoff assembly is similar to the shutoff assembly that is 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.
- Remove fuel shutoff mechanism (33) from the governor housing.
- If necessary, remove blade (34) and blade (36). Do not remove spring (35) .
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| Illustration 23 | g00522821 |
- Use needle nose pliers to remove retaining ring (37).
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| Illustration 24 | g00577214 |
- Remove spacer (39) from the throttle shaft. Remove return spring (38) from the throttle shaft.
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| Illustration 25 | g00577216 |
- Remove setscrew (43), control lever (42) and retaining ring (41) from throttle shaft (40) .
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| Illustration 26 | g00577217 |
- Remove throttle shaft (40) from the governor housing. Inspect throttle shaft (40) for wear or for damage.
- Inspect throttle shaft seal (44) carefully for wear or for damage. If the throttle shaft seal is worn or damaged, use a new part for replacement.
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| Illustration 27 | g00577219 |
- Hold cover assembly (46) in position and slowly loosen three bolts (45) in order to release the spring force.
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| Illustration 28 | g00577234 |
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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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- Remove bolts (45) and cover (46) .
- Remove upper O-ring seal (47) and spring (48). Inspect the O-ring for wear or for damage. If the O-ring is worn or damaged, use a new part for replacement.
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| Illustration 29 | g00577236 |
- Remove sleeve assembly (49) and tappet (50) .
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| Illustration 30 | g00577242 |
- Remove piston (51) from sleeve assembly (49). Inspect piston (51) and sleeve assembly (49) for wear or for damage.
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| Illustration 31 | g00577247 |
- Remove lower O-ring seal (52) from the fuel transfer pump housing. Inspect the O-ring seal for wear or for damage. If the O-ring seal is worn or damaged, use a new part for replacement.
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| Illustration 32 | g00577250 |
- Remove the governor front housing from Tool (A). Install three legs on Tool (A) and mount the governor rear housing on the three legs.
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| Illustration 33 | g00577334 |
Typical O-ring drive | |
Note: The drive group on Type V governors is known as the O-ring Drive. The O-ring drive is not serviceable. The drive group will need to be replaced as a unit if any problems exist.
Note: Inspect the cam surface on the governor drive shaft for wear or for damage. If the cam surface is worn or damaged, a new drive assembly must be installed before assembly.
- Remove cover (53) from the torque limiter.
Note: Steps 36 through 38 are for the removal of the torque limiter (if equipped).
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| Illustration 34 | g00604442 |
- Remove O-ring seal (54) from the cover for the torque limiter.
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| Illustration 35 | g00604456 |
- Remove jam nut (55) and screw (56) from the torque limiter.
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| Illustration 36 | g00604593 |
- Remove seal (58) from the governor rear housing.
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| Illustration 37 | g00604635 |
- Remove two bolts (57) and bearing block (59) from the governor rear housing.
- Loosen bolt (62) from the riser lever. Use Tool (B) to remove retaining ring (60) .
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| Illustration 38 | g00604755 |
- Remove riser lever (61) from bearing block assembly (59) .
- Remove bearing block assembly (59) from pivot shaft (63) .
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| Illustration 39 | g00604877 |
- Remove spacer (64) from pivot shaft (63) .
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| Illustration 40 | g00604890 |
- Note the position of spring (66) and remove fulcrum lever (65). Remove spring (66) from pivot shaft (63). Inspect the components of the pivot shaft for wear or for damage.
Note: Do not remove the cam from pivot shaft (63). The cam is not serviceable.
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| Illustration 41 | g00604903 |
- Push control sleeve (67) and limit sleeve (69) toward each other and compress spring (68) in order to expose retaining ring (70) .
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| Illustration 42 | g00604935 |
- Remove retaining ring (70) from the governor output servo assembly.
- Remove retaining ring (71) with Tool (C). Remove governor output servo assembly (72) by pulling out on the clevis.
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| Illustration 43 | g00605187 |
- Upon removal of governor output servo (72), sleeve (69), spring (68), and sleeve (67) will come out of the governor housing.
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| Illustration 44 | g00605196 |
- Use the following procedure to disassemble the earlier style of governor output servo assembly.
- Slide sleeve (74) against servo piston (75) .
- 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 (77) is facing upward. Use a 1U-7277 Pin Punch (Tool (E) ) to press spring pin (77) out of the clevis and the governor output servo.
Show/hide table
Illustration 46 g00605284
(D) 1U-7606 Servo Block
(E) 1U-7277 Pin Punch
(73) Clevis
- Remove clevis (73), sleeve (74) and servo valve (76). Remove O-ring seal (78). Inspect the O-ring seal for wear or for damage. If the O-ring seal is worn or damaged, use a new part for replacement.
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| Illustration 45 | g00605266 |
Governor Output Servo (Earlier Style) (73) Clevis (74) Sleeve (75) Servo piston (76) Servo Valve (77) Spring pin (78) O-ring seal | |
| 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. |
- Inspect all parts for wear or for damage. If the parts are worn or damaged, use new parts for replacement.
- Use the following procedure to disassemble the later style of governor output servo assembly.
- Slide sleeve (74) against servo piston (75) .
- 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 (77) is facing upward. Use Tool (E) to press spring pin (77) through both parts.
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Illustration 48 g00523035
(D) 1U-7606 Servo Block
(E) 1U-7277 Pin Punch
(73) Clevis
- 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 (74) 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 (75) rests on the top surface of Tool (D) .
Show/hide table
Illustration 49 g00605679
(D) 1U-7606 Servo Block
(F) 1U-7635 Clevis Driver
(73) Clevis
(75) Servo piston
- Slide the 1U-7635 Clevis Driver (Tool (F) ) over the end of servo valve (76). Position the driver so the end with the smaller diameter is against the shoulder of servo valve (76). Press against the end of the driver until clevis (73) is removed from the governor output servo.
- Remove sleeve (74), servo valve (76), O-ring seal (78) and tolerance ring (79) .
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| Illustration 47 | g00605368 |
Governor Output Servo (Later Style) (73) Clevis (74) Sleeve (75) Servo piston (76) Servo Valve (77) Spring pin (78) O-ring seal (79) Tolerance ring | |
- Inspect all parts for wear or for damage. If the parts are worn or damaged, use new parts for replacement.
- Remove two bolts (80) and bracket (81) from the governor rear housing. Inspect the bracket for wear or for damage.
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| Illustration 50 | g00605816 |
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| Illustration 51 | g00605848 |
Bracket (81) after removal from the governor rear housing. | |
- Remove lever (82) from the governor rear housing. Inspect the lever for wear or for damage.
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| Illustration 52 | g00605850 |
- Remove three bolts (83) and cover (84) from the fuel ratio control.
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| Illustration 53 | g00605986 |
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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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- Remove retainer (85) and diaphragm (86) from cover (84) .
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| Illustration 54 | g00606004 |
- Remove washer (87) and spring (88) from cover (84) .
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| Illustration 55 | g00606007 |
- Remove fuel ratio control valve (89) from the governor rear housing.
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| Illustration 56 | g00606015 |
- Remove spring (90) and spring seat (91) from fuel ratio control valve (89). Remove the piston and seal (92) from fuel ratio control valve (89). Remove return spring (93) from fuel ratio control valve (89) .
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| Illustration 57 | g00606020 |
- If necessary, remove retaining ring (94), spring seat (95), and spring (96) from fuel ratio control valve (89) .
Note: Do not remove the pin from fuel ratio control valve (89). The fuel ratio control valve and the valve body are serviced as one unit. Some fuel ratio control valves do not have a pin that joins the valve and the valve body. In this case, the valve and the valve body are serviced separately. Elimination of the pin in the fuel ratio control valve provides overfueling for easier starting. Refer to the Systems Operation, "Fuel Ratio Control (Types V, VI, and VII)" topic for more information on the fuel ratio control.
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| Illustration 58 | g00606027 |
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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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Note: Spring (96) is compressed in order to achieve a 50 N (11 lb) preload.
- Remove wire retaining clip (97) and remove solenoid (98) from the dual horsepower mechanism.
Note: The following steps are for the disassembly of the Type VI Dual Horsepower Mechanism.
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| Illustration 59 | g00621287 |
Typical example of the dual horsepower mechanism on the Type VI governor (97) Wire retaining clip (98) Solenoid (99) Bolt | |
- Remove three bolts (99) that hold the Type VI dual horsepower mechanism in position on the governor.
- Remove the dual horsepower mechanism from the governor.
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| Illustration 60 | g00621391 |
(100) O-ring seal (101) Access plug (102) Seal (103) Valve cavity (104) Spring (105) Piston assembly (106) O-ring seal (107) Collar (108) O-ring seal (109) Nut (110) Setscrew | |
- Remove O-ring seals (106) and (108) from the dual horsepower mechanism. Inspect the O-ring seals for wear or for damage. If the O-ring seals are worn or damaged, use new parts for replacement.
- Remove access plug (101) and O-ring seal (100) .
- Remove setscrew (110) and nut (109) .
- Use a large screwdriver to loosen piston assembly (105) from collar (107) .
- Remove O-ring seal (102) from piston assembly (105) .
- Remove spring (104) from the housing.
- Inspect all of the parts for wear or for damage. If any of the parts are worn or damaged, use new parts for replacement.
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 The Cleaning Guide, SEBF8354, "Equipment And Chemical Recommendations Reference Manual".