GROVE Published 10-21-2010, Control# 198-04 4-11
5540F/YB5515 SERVICE MANUAL HYDRAULIC SYSTEM
Test - Pump Output
To check the output of the hydraulic pump, use a 100 gpm
(379 lpm) flowmeter. Follow the instructions in the flowmeter
manual. For rated output, see page 4-1.
NOTE: All flow tests must be taken when the temperature
of the hydraulic oil is 120 - 130° F (45 - 54° C).
To check the efficiency of the pump, use the following
procedure:
1. Connect a flowmeter between the pump and control
valve Figure 4-5 according to the instructions in the
flowmeter manual. Make sure the needle valve on the
flowmeter is fully open.
2. Start the engine and run at maximum rpm. Wait until the
oil reaches the operating temperature.
3. Slowly close the needle valve of the flowmeter until the
pressure for the circuit being supplied by the pump
section being tested.
4. Read the amount of flow on the flowmeter. Record the
flow reading and the engine rpm.
5. Fully open the flowmeter needle valve.
6. Accelerate the engine until the engine speed matches
the speed recorded in step 4. Read the amount of flow
on the flowmeter. Record this reading.
7. Compare the results to find the efficiency of the pump.
8. If the pump is less than 80% efficient, repair or
replacement is necessary.
Percent of Pump Efficiency =
Flow at 0 psi (0 kPa)
Flow at X psi
( X ) x 100
1-Spool
Control
Valve
Flowmeter
Existing Hose to
Control Valve
Hydraulic
Pump
FIGURE 4-5
a0391
Flowmeter Installation, Typical
Reference Only
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