TM 5-3810-300-24 & P2
HYDRAULIC PUMP DRIVE
DESCRIPTION
The hydraulic pump drive gearbox is located behind the
The splined connector is pulled into the splined center of
front bumper of the carrier. in front of the engine. The
the pinion gear to engage the pumps. It is pushed back
engine drives the gearbox using a short driveline
into the input shaft to disengage the pumps. A small
connected to the front crankshaft pulley and a
shaft (shift shaft) goes through the splined connector and
companion flange on the input shaft of the gearbox..
out through the front of the case. A control cable is
The driveline rotates as the engine runs. A cable running
connect to the shaft to permit remote control of the
from the cab to the gearbox allows the pumps to be
disconnect.
engaged or disengaged.
The input shaft is mounted in the bearing support
The pinion gear drives two output pinion gears. These
housing. The input shaft is one piece. It is splined inside
gears are splined on the inside. Adaptor sleeves are
and is flanged on one end. The pinion gear is supported
used to mate the output pinion gears with the input shaft
by the bearing support housing. This pinion gear is also
of each pump. Both pumps turn at the same speed and
splined inside so it can mate with the connector
both in a counterclockwise direction.
assembly.
MAINTENANCE
TROUBLESHOOTING.
SYMPTOM
PROBABLE CAUSE
SOLUTION
1.
Oil overflow from the breather
a
Overfilled
a
Drain to the proper level.
b
The hydraulic pump shaft seal
b
Repair the hydraulic pump.
is leaking oil.
2.
Seals leaking.
a
Overfilled
a
Drain to the proper level.
b
The hydraulic pump shaft seal
b
Repair the hydraulic pump.
is leaking oil.
3.
Vibration.
a.
Loose drive shaft.
a. Tighten the flange bolts (on
both ends).
b. Bad bearings in either the
b. Inspect and replace as
input shaft, the pinion gear, or the
necessary.
output pinion gear(s).
c
Engine malfunction
c
Repair as necessary.
d
Bent driveline or worn univer-
d
Repair or replace as
sals.
necessary.
e
Driveline out of balance
e
Balance the drive shaft.
f
Worn gears
f
Replace as necessary.
4.
Noise.
a
Worn gears or bearings
a
Replace as necessary.
4-87.1
