Fore/Aft Tilt Cylinder Relief Valve; Steering Relief Valve; Drive Cross Relief Valve; Figure 3-6: Drive Cross Relief Valve - Upright SL30SL Service & Parts Manual

1
1. Top Steering Hose
2. Brake Pressure
Reducing Valve
Figure 3-5: Hydraulic Manifold Assembly, Top View

Fore/Aft Tilt Cylinder Relief Valve

(Figure 3-4)
1. Operate the hydraulic system for five minutes.
2. Remove the quick disconnect plug and install a 0-
41 bar (0-600 psi) pressure gauge.
3. Remove the plug from the end of the valve to
expose the adjusting screw.
4. With the engine running, tilt the platform fully for-
ward using the fore/aft level switch.
5. While holding the level switch forward, set the
pressure to 34.5 bar (500 psi) maximum by slowly
turning the adjusting screw, clockwise increases
pressure.
6. Replace the valve plug.
7. Remove the gauge and reinstall the plug.
8. Level the platform.
Steering Relief Valve (Figure 3-5)
1. Remove the top steering hose from back of the
manifold and replace it with a 0-207 bar (0-3000
psi) pressure gauge assembly.
2. Block the end of the hose with a cap fitting.
3. Remove the plug from the end of the valve to
expose the adjusting screw.
4. With the engine running, push the Steering
Switch RIGHT and set the pressure to 83 bar
(1200 psi) maximum by slowly turning the adjust-
ing screw clockwise to increase pressure.
SL26/30SL Work Platform
M
AINTENANCE
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3
3. Quick Disconnect
5. Replace the valve plug.
6. Remove the gauge and reinstall the hose.
Drive Cross Relief Valve (Figure 3-6)
1. Operate the hydraulic system for five minutes.
2. Remove the gauge port plug and install a 0-207
bar (0-3000 psi) pressure gauge assembly.
3. Exchange the Main Relief Valve with one drive
cross relief valve. The rear drive cross relief valve
is mounted by the left rear tire and the front drive
cross relief valve is mounted behind the control
module towards the front of the machine.
4. Remove the plug from the end of the valve to
expose the adjusting screw.
5. Remove the hex nut holding the lift coil onto the
lift valve and remove the coil.
6. With the engine running, use the chassis lift
switch to elevate the platform, hold until the sys-
tem bypasses (approximately 2 seconds).
7. While holding the chassis lift switch in the UP
position, set the pressure to 103 bar (1500 psi)
maximum by slowly turning the adjustment screw,
clockwise increases pressure.
8. Exchange the two drive cross relief valves and
repeat the procedure.
9. Reinstall the valves to their original locations and
replace all plugs when finished setting pressure.
10. Replace the drive valve coils.
Figure 3-6: Drive Cross Relief Valve (Front Shown)
Section
3.7
3-7