JLG E300 Service Manual - Manual (Page 167)

SECTION 5 - HYDRAULICS
3121253 – JLG Lift – 5-25
5.4 INITIAL HYDRAULIC PUMP START-UP
PROCEDURE
This procedure must be used when the hydraulic pump or
pump/motor assembly is removed or replaced to ensure
there is no air trapped in the hydraulic system. Having air
in the system can cause damage to the pump.
Procedure
1. Fill the hydraulic reservoir approximately 3/4 full of
hydraulic fluid.
2. Unscrew the breather/filler cap from the reservoir.
3. Connect a pressure test hose to the MP port on the
Main Control Valve.
4. Insert the other end of the pressure test hose into
the hydraulic reservoir’s breather/filler port.
NOTE: Steps 5 and 6 require an assistant.
5. From the Ground Control Console, momentarily (1
second maximum) activate the platform rotate
switch and release.