Page 3-12
Maintenance 3.12 - Hydraulic Pressure Settings
MX15/19
3.12 H
YDRAULIC
P
RESSURE
S
ETTINGS
Check the hydraulic pressures whenever the pump, manifold, or relief valves have been serviced
or replaced.
M
AIN
R
ELIEF
V
ALVE
1. Operate the hydraulic system 10-15 minutes to warm the oil.
2. Slowly drive the machine to within 3 inches of a solid, immovable brick wall. Ease the
machine forward until the front of the chassis is in solid contact with the wall.
3. Insert a 5000 psi (344bar) pressure gauge into the test port.
4. Loosen the locknut or remove the cover on the Main Relief Valve and turn the adjusting
screw counterclockwise two full turns.
5. Unhook the Platform Controls from the guardrail so that the machine may be operated from
the ground. Slowly push the control lever in the direction of the wall.
6. Slowly turn the Main Relief Valve adjusting screw clockwise to increase the pressure until the
gauge reads 3500 psi (241 bar) for the MX19, or 2500 psi (172 bar) for the MX15.
7. Tighten locknut or replace Main Relief Valve cover and torque to 6 ft/lbs (8 Nm.).
L
IFT
R
ELIEF
V
ALVE
1. Operate the hydraulic system 10-15 minutes to warm the oil.
2. Loosen locknut or remove cover on the Lift Relief Valve and turn adjusting screw counter-
clockwise two full turns.
3. Place the maximum rated load (see Specifications Table, Section 2) on the platform.
4. Turn and hold the Chassis Key Switch to CHASSIS. Push the Chassis Lift Switch to UP posi-
tion and hold it there.
5. Slowly turn the Lift Relief Valve adjusting screw clockwise to increase the pressure until the
platform just begins to rise.
6. Release the Chassis Lift Switch. Tighten locknut or replace Lift Relief Valve cover and torque
to 6ft/lbs(8Nm.).
S
TEERING
R
ELIEF
V
ALVE
1. Operate the work platform for 10-15 minutes to bring the hydraulic oil up to normal operating
temperature.
2. Connect a 3000 psi (207 bar) pressure gauge into the test port.
3. Loosen locknut or remove cover on the Steering Relief Valve and turn adjusting screw coun-
terclockwise two full turns.
4. While one person holds the Steering Switch to steer right or left, slowly turn the Steering
Relief Valve adjusting screw clockwise to increase the pressure until the gauge reads 1200
psi (82.7 bar).
5. Tighten locknut or replace Steering Relief Valve cover and torque to 6ft/lbs(8Nm.).
6. Remove gauge and replace cap.
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.
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