Page 3-9
Maintenance - 3.11 - Setting Hydraulic Pressures
SL20
3.11 S
ETTING
H
YDRAULIC
P
RESSURES
See “Hydraulic Manifold” on page 12 for the location of the relief and overcenter valves on the
hydraulic manifold.
Check the hydraulic pressures whenever the pump, manifold or relief valve have been serviced or
replaced.
WARNING
!
The hydraulic oil may be of sufficient temperature to cause burns. Wear safety gloves
and safety glasses when handling hot oil.
The oil in the hydraulic system is under very high pressure which can easily cause
severe cuts. Obtain medical assistance immediately if cut by hydraulic oil.
Figure 3-13:
Hydraulic Manifold
M
AIN
R
ELIEF
V
ALVE
1. Operate the work platform for 10-15 minutes to bring the hydraulic oil up to normal operating
temperature.
2. Remove the control module cover and install a gauge in pressure gauge port.
3. Loosen locknut or remove cover on the main relief valve and turn adjusting screw counter-
clockwise two full turns.
4. Remove the platform controller so that the machine may be operated from the ground. With
the platform empty, attempt to drive the machine up a 25%(14°) grade. Adjust the main
relief valve screw until the machine is just able to climb the slope. The pressure gauge
should read approximately 207 bar (3000 psi).
5. Tighten locknut or replace steering relief valve cover and torque to 8 Nm (6Ft/Lbs).
6. Remove gauge and replace cap.
Steering Relief
Valve
Te s t Po r t
Main Relief
Valve
Overcenter
Valves
Lift Relief
Valve
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