Genie S-40 Service Manual page 142

Section 4 • Repair Procedures
7-10
Valve Adjustments, 4WD
Drive Manifold
How to Adjust the Hot Oil Shuttle
Relief Valve
Note: The pressure differential between the charge
pump relief valve (located in the drive pump) and
the hot oil shuttle relief valve (located in the drive
manifold) is necessary to return hot oil from the
closed loop drive circuit to the hydraulic tank for
cooling. This pressure differential must be
maintained at 40 psi / 14.5 bar.
Note: The following procedure will require two
people.
1 Open the engine side turntable cover and
connect a 0 to 600 psi / 0 to 41 bar pressure
gauge to the diagnostic nipple on the drive
pump.
2 Start the engine from the platform controls and
allow the engine to run at high idle. Note the
pressure reading on the pressure gauge.
3 Turn the engine off and connect a
0 to 600 psi / 0 to 41 bar pressure gauge to the
diagnostic nipple located on the drive manifold.
4 - 46
4 Start the engine from the platform controls and
5 Turn the engine off, and remove the hot oil
6 Repeat steps 4 and 5 until the pressure reading
S-40 • S-45 • S-40 TRAX • S-45 TRAX
drive the machine slowly in the forward
direction. Note the pressure reading on the
pressure gauge.
shuttle relief valve cap (item KA). Adjust the
internal hex socket clockwise to increase the
pressure or counterclockwise to decrease the
pressure. Install the valve cap.
on the guage is 40 psi / 2.8 bar less than the
pressure reading at the pump.
February 2014
Part No. 826364