Section
3-12 AB46 Work Platform
Maintenance
3.10
3.10 Drive Pump Settings
(Figure 3-12)
NOTE: Pump is properly adjusted at factory. Pump
settings should only be checked if pump failure is
suspected.
MAIN RELIEF VALVES
Main relief valves "A" and "B" should be bench tested off
the machine.
NOTE: Main relief valves should be adjusted to
5300 PSI.
PRESSURE OVERRIDE VALVE
1. Position machine on a firm level surface.
2. Disconnect brake solenoid on hydraulic manifold to
allow brakes to remain locked.
3. Connect 6000 PSI pressure gauges at gauge port "A"
and gauge port "B".
4. With engine running at normal operating RPM,
position drive joystick control to full forward.
5. Adjust pressure override valve so pressure gauge "A"
reads 4900 PSI. Turning pressure override adjust-
ment screw clockwise increases pressure and
turning counterclockwise decreases pressure.
6. Position drive joystick control to full reverse.
6. Check pressure reading on pressure gauge at "B".
Pressure readings should be the same.
Figure 3-13: Hydraulic Pump
Gauge Port "B"
Gauge Port "A"
"A" Pressure
Relief Valve
"B" Pressure
Relief Valve
PUMP REMOVAL
1. Mark, disconnect and plug the hose assemblies.
2. Mark and disconnect the electric cables.
3. Remove hardware which secures power unit and
remove from chassis.
PUMP INSTALLATION
1. Install power unit using hardware previously re-
moved.
2. Unplug and reconnect the hydraulic hoses.
3. Reconnect the electric cables.
4. Fill the tank with clean hydraulic fluid.
5. Check the oil level in the hydraulic tank before
operating the work platform.
6. Operate the pump and check for leaks and proper
operation.
7. Replenish hydraulic fluid if necessary.
IMPORTANT: If replacing the pump, be sure the
pump and hydraulic tank are filled with oil before
starting the engine. Damage to the pump may
occur if it is run without first being filled with oil.
Figure 3-12: Pressure Override Valve
Pressure Override
Valve Adjusting
Screw
Horsepower
Limiter
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