This document provides instructions for disassembling a Type I engine governor. It lists 57 steps to remove parts like the cover, springs, flyweights, housing pieces, and shutoff assembly. Tools include a governor repair fixture, retaining ring pliers, pin punch, and clevis driver. Inspect all parts for wear and replace as specified. Take care to contain fluids and properly dispose of them.
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2. Shutdown SIS
Previous Screen
Product: ARTICULATED TRUCK
Model: D250D ARTICULATED TRUCK 6NG
Configuration: D20D & D250D ARTICULATED TRUCK 6NG00001-UP (MACHINE) POWERED BY 3116 ENGINE
Disassembly and Assembly
3114, 3116 and 3126 MUI Engine Governors
Media Number -SENR6454-05 Publication Date -01/02/2002 Date Updated -01/03/2002
i01017300
Governor (Type I) - Disassemble
SMCS - 1264-015
Disassembly Procedure
Table 1
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
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3. 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 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.
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4. 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
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5. (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) ).
Illustration 2 g00521798
2. Remove three bolts (4) .
3. Remove cover (5) .
Illustration 3 g00521800
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6. 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.
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.
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) .
a. Hold cover assembly (6) in position and slowly loosen bolts (1) in order to release the
spring force.
b. Remove three bolts (1) from the cover assembly.
c. Remove cover assembly (6) .
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7. 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.
Illustration 6 g00521803
8. Remove rear spring seat assembly (9) .
Illustration 7 g00522509
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8. 9. Remove spacer (11). Remove shims (8) from governor spring seat (9), if equipped. inspect
governor spring seat (9) for wear or damage.
Illustration 8 g00522514
10. Remove shims (13) for the high idle governor, if equipped.
Illustration 9 g00522516
11. Remove spring seat assembly (15) from the governor.
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9. Illustration 10 g00522517
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.
Illustration 12 g00522532
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10. 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.
Illustration 13 g00522534
13. Remove riser (19) from governor front housing (18) .
Illustration 14 g00522535
14. Remove retaining ring (20), two races (21), bearing (23) and shims (22) from riser (19) .
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11. Illustration 15 g00522536
15. Remove four bolts and four washers (24) that hold the flyweights in position.
Illustration 16 g00522537
16. Remove flyweights (25) .
Illustration 17 g00522574
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12. 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.
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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13. Illustration 20 g00522581
20. Remove flyweight carrier (28) and riser shaft (30) from the governor front housing.
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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14. 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.
Illustration 23 g00522821
24. If necessary, remove blade (34) and blade (36). Do not remove spring (35) .
Illustration 24 g00522822
25. Remove spring (38) for the throttle lever from throttle shaft (37) .
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15. Illustration 25 g00522823
26. Remove retaining clip (39) from throttle shaft (37) .
Illustration 26 g00522826
27. Remove spacer (43), spring (42), setscrew (41), and control lever (40) from throttle shaft
(37) .
Illustration 27 g00522898
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16. 28. Remove retaining clip (44) from throttle shaft (37) .
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.
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.
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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17. Illustration 30 g00522904
31. Use the following procedure in order to remove cover assembly (47) .
a. Hold cover assembly (47) in position and slowly loosen bolts (46) in order to release
the spring force.
b. Remove three bolts (46) and cover (47) .
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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18. Illustration 32 g00522950
33. Remove sleeve assembly (50) and tappet assembly (51) from the governor front housing.
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.
Illustration 34 g00522952
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19. Thank you very much for
your reading. Please Click
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20. 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) ).
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.
Illustration 36 g00522954
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
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21. 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) .
Illustration 37 g00523003
39. Use Tool (B) to remove retaining ring (58). Loosen bolt (57). Remove riser lever (59) from
bearing block assembly (56) .
Illustration 38 g00523005
40. Remove bearing block assembly (56) from pivot shaft (60) .
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22. 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) .
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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23. 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.
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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