Filter
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M48 Tank
8
5.14. Open the relief valve on the hydro pump that is
to be tested. This will relieve any residual
hydraulic pressure. See Figure 5.14.
5.15. Confirm that the hydraulic pressure has been
relieved by rotating the brake drum / hub assem-
bly. If the it will not rotate, confirm that the brake
is released and that the brake linkage is not
bound.
5.16. If there is any possibility of fluid contamination,
drain and flush the system, and replace the filter
before installing the new hydro pump.
5.17. Position a catch pan beneath the hydro pump to
be removed. Have four 1/2” JIC plugs and two
1/2” JIC caps within reach.
5.18. Disconnect the feed line that runs from from the
front of the hydro pump to the filter manifold
using a 7/8” wrench on the nut, and a 13/16”
wrench to hold the fitting on the hydro pump.
Plug the line, cap the fitting on the pump.
5.19. Disconnect the return line that runs from from
the outboard side of the hydro pump to the res-
ervoir using a 7/8” wrench on the nut, and an 11/
16”” wrench to hold the fitting on the hydro
pump. Plug the line, cap the fitting on the pump.
See Figure 5.14.
5.20. Disconnect the two lines that connect the hydro
motor to the back of the hydro pump using a pair
of 7/8” wrenches. Plug the lines.
See Figure 5.20.
5.21. Remove the two O ring to JIC adaptors from the
back of the hydro pump. Replace them with the
yellow shipping plugs from the replacement
hydro pump.
5.22. Remove the 90 deg. elbow fitting that the return
line was connected to using an 11/16” wrench
and a 3/4” wrench. Plug the port using a yellow
shipping plug removed from the replacement
pump.
5.23. Remove the O ring to JIC adaptor that the feed
line was connected using a 13/16” wrench. Plug
the port using a yellow shipping plug removed
from the replacement pump. See Figure
5.23.
Figure 5.14
RETURN LINE
FEED LINE
OPEN
CLOSE
RELIEF VALVE
ELBOW
Figure 5.20
HYDRO
MOTOR
HYDRO
PUMP
PRESSURE LINES
BETWEEN PUMP
AND MOTOR
ADAPTORS
Figure 5.23