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 TM 55-1905-217-34
d. Cleaning, Inspection, and Repair.
(1) Wash all of the power take-off parts except the clutch facings in solvent, (FED. SPEC. PD-680) then,
dry them with compressed air.
(2) Examine the bearings for corrosion and pitting. Lubricate each bearing with light engine oil, then,
while holding the inner race or cone from turning, revolve the outer race or cup slowly by hand and check for
rough spots.
(3) Examine the clutch facing for wear, burning or scoring. Also, check the teeth for wear or damage
and measure the thickness of the facing. Replace the clutch facing if the teeth are worn or damaged, or if the
facing is badly burned, scored or worn to the approximate worn thickness of 1/4 inch minimum.
(4) Inspect the friction surfaces of the clutch pressure plates for being flat, smooth and free from cracks
or heat checks. Also, examine the drive bosses, the keyway in the outer pressure plate, the adjusting ring
threads and the notches in the inner pressure plate.
(5) Examine all of the release levers, link pins and pin holes in the links, release levers, release sleeve
and pressure plate for wear.
(6) Inspect the clutch adjusting ring wear plate (44, fig. 3-43) and the ring threads for wear. If the wear
plate is worn excessively, reverse the plate. If both sides of the plate are worn, replace it.
(7) Examine the wear surface of the clutch release sleeve collar and the mating surface on the release
sleeve for wear and scoring.
(8) Inspect the mating surface of the clutch release yoke fingers and mating trunnions on the release
sleeve collar for wear.
(9) Check for weak or broken pressure plate separator springs (48). Check the spring load on the
springs with a spring tester. The approximate free length is 7/8 inch and the approximate outside diameter is
3/8 inch. Springs should be replaced when force exerted is less than 12-15 lbs. at 5/8 inch length.
e. Reassembly.
(1) Refer to figure 3-43 and reassemble the clutch.
(2) Attach the clutch driving ring (53) to the power take-off adapter with bolts and lock washers. Tighten
the bolts to 30-35 lb-ft torque.
(3) Tighten the drive shaft nut (55) to 165-160 lb-ft torque.
f. Installation.
(1) Support the power take-off assembly with a rope sling and chain hoist, then position the power take-
off assembly at the adapter with the clutch drive shaft in line with the pilot bearing in the coupling and flange
assembly.
(2) Push the power take-off toward engine and guide the end of the drive shaft straight into the clutch
pilot bearing and engage the teeth on the outer diameter of the clutch facing with the teeth in the inner diameter
of the driving ring.
(3) Guide the pilot on the clutch housing straight into the front end adapter opening, then install the
clutch housing to adapter bolts and lockwashers. Tighten the bolts to 30-35 lb-ft.
g. Clutch Adjustment. Adjust the clutch (TM 55-1905-217-12, para 4-84).
Section II. ENGINE COMPONENTS AND TRANSMISSION
3-13. Cylinder Head, and Injector Control Tube
a. Removal.
(1) Drain the cooling system to a level below the head. (TM 55-1905-217-12, para 4-22).
22).
(3) Remove Rocker arm cover (TM 55-1905-217-12).
(4) Slide thermostat housing clamp and packing back on water manifold. Remove thermostat and
housing (TM 55-1905-217-12, para 4- 44).
(5) Loosen the injector control tube bracket bolts as shown in figure 3-44. Lift control tube up and away
from head.
3-62
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