M48 Tank
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.
RETURN LINE
FEED LINE
CLOSE
OPEN
ELBOW | RELIEF VALVE |
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.
HYDRO | PRESSURE LINES |
| |
PUMP | HYDRO | ||
BETWEEN PUMP | |||
| MOTOR | ||
| AND MOTOR | ||
|
| ||
| ADAPTORS |
|
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 5.23
8
