Section 2 - Service and Repair
Hydraulics
114101-000 X26 Ultra Narrow - Service Manual
Page 2-23
S
E T T I N G
H
Y D R A U L I C
M
A N I F O L D
P
R E S S U R E S
Check the hydraulic pressures whenever the pump, manifold, or relief valves have been serviced or
replaced.
W A R N I N G
!
!
The hydraulic fluid may be of sufficient temperature to cause burns. Wear safety gloves and safety glasses
when handling hot fluid.
The fluid in the hydraulic system is under very high pressure which can easily cause severe cuts.
Obtain medical assistance immediately if cut by hydraulic fluid.
Figure 2-17:
Hydraulic Manifold Adjustment
M
AIN
R
ELIEF
V
ALVE
1. Operate the hydraulic system 10-15 minutes to warm the fluid.
2. Slowly drive the machine to within 8 cm (
3 in.
) of a solid, immovable brick wall. Ease the machine for-
ward until the front of the chassis is in solid contact with the wall.
3. Insert a 0-207 bar (
0-3000 psi
) pressure gauge into the test port.
4. Loosen the locknut or remove the cover on the Main Relief Valve and turn the adjusting screw counter-
clockwise 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 Handle in the direction of the wall.
6. Slowly turn the Main Relief Valve adjusting screw clockwise to increase the pressure until the gauge
reads 193 bar (
2800 psi
).
7. Tighten locknut or replace Main Relief Valve cover and torque to 8 N-m (
6 ft./lbs.
).
Test Port
Lift Relief Valve
Counterbalance
Valves
Main Relief Valve
Steering Relief
Valve
