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 TM 55-1925-204-12
(b) Lubricate worm gear and worm wheel gear, for
(2) Inspection.
distance of travel, with a light engine oil. Wipe away excess
(a) Inspect glass and dial for damage or .defect.
oil.
Replace a defective water temperature gage.
(3) Installation. Check that governor control rod is in NO
(b) Check capillary for damage. Replace a water
FUEL position, and that throttle indicator is positioned at
temperature gage (thermometer, indicating) when capillary is
STOP, then reverse the procedure in step (1) above to install
damaged.
the throttle.
(3) Installation. Install the water temperature gage by
reversing the procedure in step (1) above.
e. Ammeter.
5-28. Batteries
(1) Removal.
a. General. The engines 24 vdc electrical starting system
(a) Tag and remove the electrical leads from rear of
uses four batteries with connectors in series.
the ammeter (fig. 5-60).
b. Maintenance.
(b) Remove the mounting hardware from rear of the
(1) Inspect for cleanliness. Clean batteries and grease
instrument panel, then lift ammeter out of the panel from the
terminals to prevent corrosion.
front.
(2) Remove battery caps, check water level (1/4 inch
(2) Inspection.
above plates), then use hydrometer to test the specific gravity
(a) Inspect the glass for cracks, or missing glass,
of all cells (TM 9-6140-200-14).
and readability of dial markings.
Replace a damaged
c. Removal and Installation.
(1) Loosen nuts, then remove all connector cables.
(b) Check the reading accuracy by comparison with
(2) Lift old batteries out of box.
the ammeter on the remaining auxiliary set. Replace a
(3) If necessary, fill new batteries with electrolyte, then
defective ammeter.
install batteries in box. Reconnect all cables on clean
(3) Installation. Install the ammeter by reversing the
terminals, then apply a coating of grease to prevent corrosion.
procedure in step (1) above.
f. Tachometer and Drive Shaft.
5-29. Power Generator (Model I-3644)
(1) Removal.
a. General. The Delco 40-kw, 120-volt dc generator is
(a) Disconnect drive shaft and shaft housing from the
direct coupled to the General Motors diesel engine. The
tachometer housing (fig. 5-60).
generator is a six-pole, self excited, compound machine of the
(b) Remove drive shaft from the adaptor at the
single bearing type.
engine rear cover, then remove the adaptor.
b. Maintenance and Adjustment (TM 55-506).
(c) Remove capscrews and lockwashers securing
(1) Lubricate in accordance with lubrication order 55-
tachometer to the timing gear cover, then lift housing away
1925-204-12-5).
from the timing gear cover. Remove the adaptor.
(2) Keep the generator clean inside and out. Wipe all
(2) Inspection. Inspect the tachometer and drive shaft
loose dirt from cover before opening. Blow out loose dirt from
for visible defects, broken glass, broken or twisted shaft.
windings and brush rigging periodically with dry, low-pressure
Replace a defective shaft or tachometer.
air (25 psi maximum) .
(3) Replace brushes when they are worn to 1 1/4 inch
measured on the long side of the brush. New brushes must be
NOTE
sanded to the contour of the commutator.
At installation be sure that drive adaptor
(4) Be sure that brushes move freely in holder, and
is correctly aligned with the drive shaft.
adjust spring tension to 1.5 to 2 psi of brush contact surface.
c. Removal.
(3) Installation. Install the tachometer and drive shaft by
(1) Remove band (fig. 5-61) between diesel engine
reversing the procedures in step (1) above.
flywheel housing and generator and lift clear of generator.
g. Throttle.
(1) Removal.
(a) Disconnect the throttle from the throttle control
rod.
(b) Remove three machine screws (fig. 5-60) then
withdraw throttle from the panel.
(2) Inspection.
(a) Inspect the spring tension clip of the throttle
control, the worm gear and its bushing and the throttle vernier
control shaft for excessive wear or other defect. Replace
defective components.
5-81
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