TM 5-3895-382-24
Propel Pump Synchronization
Flushing Valve
(1) Test port for axle pump (forward direction). (2) Test port for dram
pump (forward direction). (3) Test port for axle pump (reverse
direction). (4) Test port for drum pump (reverse direction).
Refer
to
the
WARNING
on
the
first
page
of
Troubleshooting.
NOTE:
This test must be performed outside in an area
clear of obstacles and personnel.
1.
Conned four 0 to 60 000 kPa (0 to 8700 psi) gauges to
test ports (1), (2), (3) and (4) on the flushing valve.
Mark the gauges to correspond with the test ports they
are connected to. Use lines with enough length so the
gauges can be read from the driver seat.
NOTE:
Drum and axle pumps should come on stroke at
the same time in both forward and reverse
directions. If not, adjust by turning the length of
the external linkage rod (7) between the pumps. If
adjustment is required, neutral start switch must
be rechecked.
2.
Start and run the engine at high idle until the hydraulic
oil temperature reaches 38°C (100°F). Engine rpm
should be 2350 ± 50 rpm.
3.
Move the speed selection switch to the LOW speed
position.
4.
Move the propel control lever forward to full speed.
Record the reading of the gauges connected to test
ports (1) and (2).
5.
Move the propel control lever in reverse to full speed.
Record the reading of the gauges connected to test
ports (3) and (4).
Axle Propel Motor
(5) Maximum displacement screw.
NOTE:
The engine has been removed for photographic
purposes.
6.
If axle and drum readings differ by more than 1378 kPa
(200 psi) in low range adjust axle motor maximum
displacement screw (5).
7.
Move the speed selection switch to the HIGH speed
position.
8.
Move the propel control lever forward to full speed.
Record the reading of the gauges connected to test
ports (1) and (2).
9.
Move the propel control lever in reverse to full speed.
Record the reading of the gauges connected to test
ports (3) and (4).
Axle Propel Motor
(6) Minimum displacement screw.
NOTE:
The engine has been removed for photographic
purposes.
10.
If axle and drum readings differ by more than 1378 kPa
(200 psi) in high range adjust axle motor minimum
displacement screw (6).
11-45
