Radiator and Water Pump

TM 10-3930-242-34

l e v e r . Engine speed should be between 800 and

speed spring (12) and seat (13) from the housing

1000 rpm.

(14).

h . Cleaning and Inspection.

( 8 ) Check the gap between the low speed

cap (11) and the high speed plunger (10) with a

(1) Clean the governor housing components

0.0015 inch feeler gage. If gap is incorrect, reset

and mounting hardware. Use a dry cleaning

solvent such as P-D-680, or equal.

gap adjusting screw.

(9) Install the governor cover. The governor

(2) Clean all bearings.

cover should be placed on the housing (14) with

( 3 ) Inspect bearings for corrosion and flat

the pin of the speed control lever projecting into

spots,

s l o t of differential lever.

( 4 ) Examine weight carrier pins for wear.

(10) Install the screws fingertight. Pull

( 5 ) Inspect spring seat, plunger adjusting

cover away from engine and tighten screws.

screws, locknuts, and other parts of control

This step will properly locate cover on governor

h o u s i n g for defects.

i. Reassembly. Refer to figure 3-11 (sheets 1

housing.

m. Adjust Maximum No-Load Engine Speed.

a n d 2) and reassemble the govern assembly.

(1) At normal engine operating tempera-

NOTE

t u r e and throttle control (accelerator) in full

Low speed weights are identifiable by their short

f u e l position, check engine rpm. Recommended

cam arms and three center laminations, each ap-

m a x i m u m no-load rpm is 2,700 15.

proximately 9/64 inch (0.140 inch) thick on weight

(2) Stop engine and, if necessary, adjust the

carrier. High speed weights are identified by long

cam arm and three center laminations; middle

no-load speed as follows:

lamination is 3/16 inch thick and the outer ones are

(a) Remove the high speed spring re-

1/8 inch thick

tainer (7, fig. 3-11 ), high speed spring (8) and

NOTE

p l u n g e r assembly (10).

The weight pin retainers must be installed in

CAUTION

same position from which they were removed.

To prevent the low speed spring and cap

j. Installation. Refer to figure 3-10 and reins-

from dropping into the governor, be care-

t a l l the governor.

ful not to jar the plunger assembly while

k. Buffer Screw Adjustment. With the engine

it is being removed.

at normal operating temperature and at idle

speed turn the buffer screw (29, fig. 3-11(1))

(b) Remove the high spring (8) from the

clockwise until it lightly touches the differential

h i g h speed pluger and add or remove shims (9)

lever (19). Tighten the buffer screw just enough

a s required to establish desired engine no-load

t h a t it eliminates the engine roll. After the buf-

speed.

f e r screw is properly adjusted, tighten the lock-

NOTE

n u t by turning it clockwise, while at the same

For each 0.0010 inch shim added, engine speed will

time holding the buffer screw so it does not turn

be increased approximately 10 rpm.

out of adjustment.

(c) R e p l a c e h i g h s p e e d s p r i n g ( 8 ) o n

NOTE

p l u n g e r (10) and assemble spring assembly into

Do not adjust the engine idle speed more than 15

governor housing (14). Install spring retainer (7)

rpm with the buffer screw.

i n governor housing and tighten it securely.

1. Governor Adjustment.

(d) Start engine and recheck engine no-

(1) Bring engine to operating temperature;

load speed. Repeat steps (a), (b), and (c) as neces-

s t o p the engine.

s a r y to establish no-load speed.

( 2 ) Remove the high spring retainer cover

3-8. Radiator and Water Pump

(3, fig, 3-11 ).

(3) Back out buffer screw until it extends 5/8

a. General. The radiator assembly is bolted to

i n c h beyond governor housing.

f r o n t of engine base (rear end of forklift). To

( 4 ) Remove valve rocker cover.

increase cooling efficiency of the radiator, a fan

(5) Start engine and adjust idle speed screw

shroud is positioned around the fan. A fan guard

to obtain 650 rpm.

i s securely attached to shroud. The water pump

( 6 ) Shut engine down and remove governor

i s of the high-capacity, centrifugal-type. It is

cover.

b e l t driven at greater than engine speed and it

(7) Start the engine and control speed man-

e f f e c t i v e l y circulates the coolant through the

ually by operating the injector control tube

c o o l i n g system.

3-13