TM 55-4920-384-13&P
manifold and lift into position on test stand,
and dry thoroughly. Clean all other metal parts in
an approved solvent and dry with a lint-free cloth.
b. Replace four (4) mounting bolts and tighten.
(2) Inspect the terminal studs for corrosion.
c. Replace fan
belt (32, fig. 4-6) and
tighten al-
Remove all corrosion and apply a thin film of
ternator bracket,
grease.
d. Connect oil gage line at rear of magneto and
(3) Inspect the brushes. Replace brushes that
replace magneto ground wire.
are oil soaked or worn or less than half their origi-
e. Connect fuel line to fuel filter.
nal length.
f. Connect throttle and choke cables.
(4) Inspect the pulley and fan for cracks,
g. Connect flexible exhaust pipe to
exhaust man-
breaks, and distortion. Straighten a bent or dis-
ifold and tighten clamp.
torted pulley and fan. Replace a pulley or fan dam-
h. Connect positive cable to starter and negative
aged beyond repair.
cable to battery.
(5) Inspect all attaching hardware for dis-
i. Replace hydraulic pump per instructions in
tortion and damaged threads. Replace if defective.
j. Refer to operating instructions for checking
engine and test stand operation.
lator is a 24-volt integral unit provided to control
the charging current from the alternator to the bat-
4-10. Hydraulic Pump and Tank Removal. The
tery.
following procedures describe removal of the
(1) On-engine testing. Defects in the alterna-
hydraulic pump and tank assembly.
tor or regulator are indicated on the ammeter by a
continuous high-chargingrate when the battery is
low, or by a low or no-charging rate when the bat-
b. Drain hydraulic fluid reservoir before pro-
tery is fully charged.
ceeding.
(2) When a high charging rate is indicated the
c. Remove plumbing from reservoir.
trouble is in the regulator or battery. Replace or re-
pair the defective unit.
e. Remove inlet and outlet lines at hydraulic
f. Remove volume control and compensator con-
4-8. Engine Removal. Remove engine assembly
g. Secure hydraulic pump body to hoist.
engine components).
h. Remove chain drive and unfasten 4 mounting
bolts (40, fig. 4-5) which secure pump to mounting
a. Remove hydraulic pump assembly per in-
i. Move pump to rear approximately 6 inches and
b. Disconnect negative cable at battery and posi-
tive cable at starter.
lift free of stand with hoist.
c. Disconnect fuel line at fuel filter and plug line
4-11. Hydraulic Pump
Replacement. To
replace
the hydraulic pump proceed as follows:
d. Disconnect oil gage line located at rear of
magneto and remove magneto ground wire.
a. Secure hydraulic pump to hoist and lift into
position.
b. Replace 4
mounting bolts (40, fig. 4-5) and
se-
f. Disconnect flexible exhaust pipe at the
ex-
cure pump to mounting adapter (26, fig. 4-5). Re-
haust manifold.
place chain drive.
g. Remove throttle and choke cables at engine
c. Replace volume control and compensator con-
connection points.
h. Remove four (4) mounting bolts in engine
d. Connect inlet and outlet lines at hydraulic
base.
.
i. Secure engine with
hoist through the
exhaust
e. Replace reservoir (1, fig. 4-4) and
connect all
manifold web, hoist until free of test stand.
plumbing.
4-9. Engine Replacement. To replace engine pro-
f. Fill reservoir with hydraulic fluid and run test
ceed as follows:
stand per operational procedure.
a. Secure engine with hoist to web of exhaust
4-11