TM 5-3805-260-24
RELIEF VALVES
A 2P8421 Adapter and parts from the 5S5 123
Hydraulic Test Group are needed to test the pressure
setting of the relief valves.
Relief Valve for the Elevator
The engine must be stopped before the test gauge
and the cover for the oil line are installed.
Install the 4M5317 Reducing Bushing in the 5P3501
Adapter, then install both in the 2P8421 Adapter. Install
the 7S8714 Pressure Gauge (0-4000 psi) on the 4S4648
Hose Assembly, then install the hose in the reducing
bushing.
PRESSURE TEST LOCATION
(Under the Machine)
1. Plug.
The plug (I) in the line from the pump is under the
front of the transmission and is near the left side of the
frame.
Hydraulic oil will run out when plug (1) is removed so
immediately install the hose and gauge assembly when
plug (I) is removed.
CONNECTIONS IN LINES TO ELEVATOR MOTOR
2. Bolt (four in the connection of the oil line for
elevator forward).
Remove bolts (2) and install the 5H4020 Cover in the
connection for the oil line that goes into the hydraulic
motor nearest the drive end. Use longer bolts through
the connection when the cover is in the connection.
When the test equipment is installed, start the
engine and run it at low idle rpm. Slowly move the
elevator lever to the FORWARD position for not more
than 5 seconds. The high reading on the gauge is the
pressure setting for elevator relief valve (3).
NOTE: Increase engine rpm, if necessary, to make this
pressure test.
The correct pressure setting for relief valve (3) is
2500 - 50 psi (175.8 3.5 kg/cm2) (17 250 - 345 kPa).
ELEVATOR RELIEF VALVE
(Under the Machine)
3. Relief valve. 4. Locknut. 5. Adjustment screw.
The elevator relief valve (3) is under the machine in
front of the drive axle and near the left side of the frame.
To adjust, loosen locknut (4) and turn adjustment screw
(5) only a few degrees; clockwise to increase or
counterclockwise to decrease the pressure setting.
Tighten locknut (4) and then make another elevator relief
valve test.
When the pressure setting adjustment for the
elevator relief valve is correct, stop the engine and
remove the test equipment.
Relief Valve in the Control Valve
The engine must be stopped before the test gauge is
installed. Install the 4M5317 Reducing Bushing in the
5P3501 Adapter, then install both in the 2P8421 Adapter.
Install the 7S8714 Pressure Gauge (0-4000 psi) on the
4S4648 Hose Assembly, then install the hose in the
reducing bushing.
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