remove the lines and fittings. proceed as follows:
3-67. Description.
(a) Isolate the line and relieve hydraulic system
3-68. The system pressure is developed by a
pressure.
hydraulic pump unit mounted on the transmission. The
(b) To disconnect a hydraulic line, hold the
pump unit is driven through the right-angle drive, which
connector firmly with one wrench and apply the turning
engages the transmission power take-off. A magnetic
force to the nut with another wrench. Disconnect and
clutch engage the pump unit with the right-angle drive.
remove the line assemblies at the connections with
System oil is contained in a 15-gallon reservoir mounted
associated parts, and between lines at elbows, unions,
on the rear right fender. A selector valve, controlled by
and tees as required. Be sure to remove line clips, if
the driver, directs oil to the hydraulic cylinders.
present, before attempting to remove the line.
After
(c) Plug all open hydraulic lines and ports with
replacement of any hydraulic components (valves,
appropriate plugs to prevent entry of foreign matter.
filters, ram cylinders, tubing, pumps, etc) or after
(2) Installation. Assure that the connector is
draining and refilling the reservoir with oil, air must be
installed in the final position on the component to which
eliminated from the hydraulic system. Following the
the connection will be made. To install lines and fittings,
replacement of any components, fill reservoir (see
proceed as follows: (a) Remove protective plugs from
lubrication order LO 92590-213-12) and check system
ends of line assemblies and clean line assemblies
for leaks. Activate the hydraulic system and operate the
thoroughly, using drycleaning solvent or mineral spirits
moldboard up and down several times. This action will
paint thinner. Dry with dry compressed air.
eliminate air from the lines and restores positive
Note. If dry compressed air is not available,
reaction relative to the control levers. Check reservoir
oil level and refill if necessary.
place line assembly on a previously cleaned area
Note. If poor response to the controls persists,
and allow to set for a minimum of five minutes prior
notify supporting maintenance personnel.
to installation.
3-32
