63h34c04 student handout 1
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1 M88A1 APUM88A1 APU______________________________________
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Location:
Right/Rear
Side Of
Vehicle
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APU
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4
The fuel system filters and delivers fuelto the engine Cylinders at the correct
time for ignition. The system consists of
a primary fuel filter, secondary fuel filter,
injection pump and fuel injection
nozzles. ( DJBMA has a fuel transfer
pump and sediment bowl )
Fuel System
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5 Primary andSecondary Fuel
Filters
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Emergency
Fuel Shutoff
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Injection pump The injection pump is a constant stroke,plunger-type pump. The pump is driven by the camshaft
and it delivers an accurate amount of fuel under high
pressure to the injection nozzles.
Injection nozzles The injection nozzles open at apressure of about 1750 psi. and deliver fuel in a fine spray
to the pre combustion chamber at the correct time for
ignition.
Fuel return Excess fuel is returned to the fuel tank aftereach injection cycle attached to each injection nozzle.
A bleed valve on the return line allows excess fuel to
Combine with flow-through fuel from the injection pump.
Fuel System Components______________________________________
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Fuel transfer pump ( DJBMA ) The fuel transferPump operates off the engine camshaft. Fuel is pumped
From the vehicle right side fuel tank (M88A1 only) through
The primary and secondary fuel filters to the fuel
injection pump.
Fuel System Components
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Injector nozzleInjector nozzl
PreheaterGlow plug
Fuel return
Sediment bowl
Fuel transfer
pumpInjector pump
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10Preheat Relay & Fuel Shutoff
Preheat Relay Fuel Shutoff
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11Pressure lubrication is provided to all working parts
of the engine. The lubrication sys. Includes a gear-type
oil pump assembly with oil intake cup, a bypass valve,
an oil cooler and oil filter mounted on the oil filter adapter
assembly. Oil lines and passages distribute oil to the
working parts of the engine. A crankcase breather is
used to aid oil consumption control. The stand-pipe
breather, located under the rocker arm cover, vents
crankcase fumes from the rocker arm cover to the
cylinder head intake port.
APU Lubrication System
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Oil pump assembly The oil pump is mountedOn the gear case back plate and is driven by the
crankshaft gear. The pump draws oil from the
crankcase, through the screened oil intake tube, to the
oil filter.
Oil filter The oil filter element is mounted on the oilfilter adapter. Oil drawn from the crankcase by the oil,
pump is forced through the oil filter to the rocker armcover, the crankshaft and camshaft bearings, and
the connecting rod bearings. Oil then flows through the
connecting rod passages to the piston pin bushings.
Lubrication Components
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Oil cooler The oil cooler is mounted is mounted onthe oil cooler plate and is located above the flywheel.
Hoses connect the oil cooler to the oil filter adapter.
Bypass valve assembly The oil bypass valve islocated on the rear bearing plate and is used to control
oil pressure. The valve is normally closed. When oil
pressure reaches about 25 psi the valve opens, allowing
excess oil to flow directly back to the crankcase.
Oil pressure switch The normally open contactsof the oil pressure switch close at 14 + 2 psi decreasing
pressure. The contacts open at 14 + 2 psi increasing
pressure.
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14A. Oil Pump Assembly
B. Oil Intake cup
C. Bypass valve
D. Oil Cooler
E. Oil Filter
F. Crankcase Breather
G. Standpipe Breather
H. Rocker Arm Cover
Component Locations
E
F
G H
D
C
A
B
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i . Oi l Drain Valve
j. Drain Handle
Component Location Cont.
i
j
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16
A 300-ampere, 28 + 7 volt generator functions as a
starter motor. When the preheat switch is actuated, 24
volts direct current (vdc) is applied to the generatorfield coil from the preheat relay. When the start switch
is actuated 24 vdc is applied to the generator armature
from the starting relay. This motorizes the generator.
The generator is coupled to the engine by a drive chain.
When the engine starts, the current in the armature
reverses direction, and the motorized generator
resumes normal generator operation.
Generator
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17Starter/Generator
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18Chain Case & Drive
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19Starter Relay
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20The auxiliary system of the vehicle has the
following functions: to supply power for control
and emergency operation of the boom; to supply
power for control and emergency operation of
the spade and winches; and to supply power for
operation of refuel pump and impact wrench.
Auxiliary Hydraulic System
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Hydraulic Pump
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22The constant speed governor maintains engine speed at 2000 + 100 rpm
during changes in power demands, by automatically varying the throttle
position. Adjusting the engine speed a hand held stroboscope must be
used. ( TM 9-2350-256-34-1 Pg. 4-20.3 )
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B. Injection pump
C. Control lever
D. Linkage & arm
E. Shaft
F. Yoke
G. Cam gear
H. Cup
I. Fly balls
A. Speed adjustment nut
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J. Sensitivity adjustment nut
A
B
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JC
Governor System ______________________________________
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24Power Train
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25 Fuel Transfer Controls
FOUR-WAYSELECTOR VALVE FLOWREGULATOR
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PUMP
MOTOR
Refuel Pump and Motor______________________________________
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27 APU Control Box
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28APU Schematics
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