H Y D R A U L I C
S Y S T E M
TM 5-3805-258-24-1
T E S T I N G
A N D
A D J U S T I N G
2. After oil does not drain out of loosened plug (1),
remove the plug. Install an 8J8559 Plug where
plug (1) was removed. Install a 6V3965 Valved
Nipple in the plug. Use a 6V4143 Coupler to
connect a hose and pressure gauge (0 to 50000
kPa (0 to 7500 psi) to the valved nipple.
3. Start the engine and lift the lift arms until they
are parallel with the ground. Move the tilt con-
trol lever to DUMP position until the bucket
is fully dumped. Release the tilt control lever.
R E L I E F V A L V E F O R T H E R O D E N D O F T HE
T I L T
C Y L I N D ER
2. Cap (on relief valve).
4. Increase engine speed to high idle rpm. Look
at the test gauge and move the lift control lever
to RAISE position. The high reading on the
test gauge is the pressure setting of the relief
valve. The high reading on the test gauge must
be 20 700 ± 340 kPa (3000 ± 50 psi).
5. If it is necessary to change the pressure setting
of the relief valve, lower the bucket to the
ground and stop the engine.
6. Remove cap (2) from the relief valve and turn
the plunger either clockwise for an increase
or counterclockwise for a decrease in the pres-
sure setting of the relief valve.
7. When the pressure setting is correct, install
cap (2) on the relief valve, remove the hose with
the pressure gauge. The plug and valved nipple
can be left on the machine.
NOTE: The pressure setting of a new relief valve
for the rod end of the tilt cylinder is 20700 ± 340
kPa (3000 ± 50 psi) with an oil flow of 38 ± 4 liter/
min (10 ± 1 U.S. gpm).
NOTE: If a test is to be made for the relief valve for
the head end of the tilt cylinder, do not install the
cover over the control valve.
Relief Valve For Head End Of Tilt Cylinder
The relief valve for the head end of the tilt cyl-
inder has a higher pressure setting than the main
relief valve. Because of this high pressure setting
an 8S3033 Electric Hydraulic Pump is used to test
the relief valve.
1. Stop the engine. Loosen, but do not remove,
plug (1) in the elbow to decrease the pressure
of the oil in the lines to the head end of the
tilt cylinder.
R I G H T S I D E O F T I L T C Y L I N D ER
1. Plug in head end circuit. 2. Hose assembly to head end
of tilt cylinder.
After the oil does not drain out of loosened plug
(1), remove the plug. Install an 8J8559 Plug
where plug (1) was removed. Install a 6V3965
Valved Nipple in the plug. Use a 6V4143
Coupler to connect hose to the valved nipple.
Install a tee (8), a 50,000 kPa (7500 psi) pressure
gauge (3) with the necessary fittings to the hose
assembly and the hose from the 8S3033 Electric
Hydraulic Pump.
T Y P I C A L G A U G E A N D F I T T I N GS
3. Pressure Gauge. 4. Coupler. 5. Coupler. 6. Adapter.
7. Nipple. 8. Tee. 9. Nipple.
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