Lull 1044C-54 Series II Service Manual - Manual (Page 121)

Supply, Pressure, and Return Hydraulics
31200079 5-39
6. Adjust pressure relief valve setting to 100 psi over that of system's
maximum rated pressure.
Important: Be sure the load valve is open before starting the engine.
7. Start the engine and, when it is at normal operating temperature, open
the throttle control all the way. Slowly close the load valve to load the
system. (Do not exceed system's maximum rated pressure). Continue
loading until normal operating temperature of the system is reached
(see “Hydraulic Oil Working Temperature @ under Specifications @ for
your model forklift in Section 2).
8. Open load valve. Record maximum pump flow at zero pressure.
9. Slowly close the load valve until the system is at the maximum rated
pressure. Record the pump flow.
10. Open load valve until pump pressure is again at zero.
11. Shut off the engine.
12. Disconnect test loop from pump and return filter housing. Reconnect
pump pressure hose (Item 6) and install hex cap (Item 2) atop return
filter housing.
Pump flow at maximum pressure should be at least 75 percent of the rated
pump flow. For rated pump flow, see “Hydraulic Pump”, under
“Specifications”, in Section 2.
Repair or replace pump if pump flow rate is less than 75 percent of rated
capacity. see “Hydraulic Pump” on page 5-30 for replacement pump
procedures.