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M48 Tank
5
NOTE: The test can be performed at either line
between the pump and the motor. The top line
on the motor is the in line from the pump when
driving forward. The linkage has more travel in
forward than it does in reverse, so the test is
most easily done on the top line of the pump,
driving the pump in the forward direction for-
ward.
4.11. Connect the flow meter end of the test kit to the
hydro motor.
4.12. Remove the plug from the line coming from the
outboard port on the hydro pump. Use the 18”
test kit line to connect the pressure gauge end of
the hydraulic test kit to the line coming from the
hydro pump. See Figure 4.12.
4.13. Tighten all the fittings.
4.14. Insure that no unsafe conditions will result from
starting the engine and operating the drive sys-
tem.
CAUTION: The technician will be exposed to
moving parts during this procedure. They
should not reach past or around any moving
parts during this test, nor should they place
themselves in any position where a loss of foot-
ing or balance might bring them into contact with
rotating components. Loose hair or garments
should be secured to avoid the possibility of
entanglement with rotating components.
Figure 4.12
4.15. Remove the stop bolt that sets the end of the
travel of the lap bar that controls the hydro pump
to be tested. See Figure 4.15.
4.16. Confirm that the valve on the test kit is fully
open.
4.17. Start the engine and purge the hydraulic sys-
tem as follows:
4.18. Cycle the lap bar from full forward to full reverse
5 times at 10 second intervals.
4.19. Close the relief valve on the hydro pump and
repeat the cycling process to purge any remain-
ing air from the system.
4.20. Check for and repair any leaks.
4.21. Check the fluid level in the hydraulic reservoir.
Top it up if necessary.
4.22. Continue to operate the drive system to warm-up
the hydraulic fluid.
NOTE: Performing the test with cold fluid will
make a significant difference in the flow readings
obtained. The test will not be valid.
Figure 4.15
STOP BOLT
JAM NUT