TM 5-3810-300-24&P-3
14.5
FUEL MODULATING GOVERNOR AND INJECTOR
RACK CONTROL ADJUSTMENT
Adjust the exhaust valve clearance and time the fuel
injectors before adjusting the governor and injector rack
control levers.
Governor Adjustment Sequence
The following seven basic steps in setting a fuel
modulating type governor must be performed in the order
listed. Any deviation from this order may result in an
improperly adjusted governor.
1
Set the fuel modulating spring tension.
2
Set the low speed spring gap.
3
Check the fuel modulating gap closing space.
4
Set the fuel modulating cam.
5
Set the injector racks.
6
Set the no-load high speed.
Fig. 1 - Fuel Modulating Governor Spring
7
Set the idle speed.
9
Housing Plug
46
Buffer Screw
31
Operating Lever
47
Modulating Cam
Only Settings 1, 3 and 4 are new and peculiar to the fuel
32
Torsion Spring Screw
48
Cam Adjusting Screw
modulating governor. Steps 2, 5, 6 and 7 are the same
35
Differential Lever
49
Lock Nut
or similar to those of the limiting speed governors.
36
Torsion Spring
50
Cam Lock Screw
However, the following adjustment procedures should be
37
High Speed Lock Nut
51
Plugging Screw
thoroughly studied and carefully followed.
38
High Speed Adjusting
52
Retaining Spring Pin
Screw
53
Washer
The seven basic settings are set forth in bold face type in
39
High Speed Spring
54
Modulating Spring Seat
the following pages. The adjustments required before
Plunger
55
Modulating Spring
each of these seven settings can be made are set forth
40
Modulating Screw
56
High Speed Spring
Lock Nut
57
Modulating Spring
prior to each setting and are listed as "Preliminary
41
Modulating Speed
Plunger
Adjustment".
Adjusting Screw
58
Low Speed Spring
Seat
No. 1-Fuel Modulating Spring Tension Setting
42
Idle Speed Screw
59
Low Speed Spring
Lock Nut
60
Retainer Ring
Preliminary Adjustment
43
Idle Speed Adjusting
61
Low Speed Spring Cap
Screw
62
Lock Nut
A
Remove the governor adjustment cover (44), Fig
44
Adjustment Cover
63
Low Speed Gap
45
Buffer Screw Lock Nut
Adjusting Screw
1, control housing cover, housing plug (9) and
copper gasket
Disconnect
the
governor
not to back the screw out too far as it is possible to turn it
external control linkage and remove the valve
completely out of the low speed spring seat (58).
rocker cover.
NOTE: If the type of fuel modulating
B
Loosen the idle speed screw lock nut (42) and back
spring (55) is not known (70, 95, 150,
out idle screw (43) until the low speed spring (59)
175 or 225 lbs. per inch), consult the
exerts no pressure on the low speed spring cap
Chart on Fuel Modulating Governors,
(61)
This may be determined by moving the
RPM, and Springs in Section 2.7.1. The
low speed cap in and out Use care
type of spring is identified by color code
(and must be known) before proceeding
with preliminary adjustment "C" below.
C. Loosen the high speed lock nut (37) and turn the high
speed adjusting screw (38) into the body
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