Multi Pro 5800 Hydraulic SystemPage 5 − 31
Traction Circuit − Charge Pump Flow Test
The charge pump flow test should be performed to make
sure that the traction charge circuit has adequate hy-
draulic flow.
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes. Make sure the hydraulic tank is full.
2. Park machine on a level surface, stop engine, en-
gage parking brake and remove key from the ignition
switch. After turning engine Off, operate all hydraulic
controls to relieve hydraulic system pressure.
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
3. Thoroughly clean tee fitting and hydraulic hose at the
front of the charge circuit oil filter under the hydraulic
reservoir (Fig. 25).
IMPORTANT: Make sure that the oil flow indicator
arrow on the flow meter is showing that the oil will
flow from the pump (disconnected hose), through
the tester and into the oil filter (tee fitting).
4. Install tester with pressure gauge and flow meter in
series with the tee fitting and the disconnected hose.
Make sure the tester flow control valve is fully open.
5. Start engine and run at low idle speed. Check for any
hydraulic leakage from tester and hose connection. Cor-
rect any leaks before proceeding.
6. Move throttle so engine is running at high idle speed
(Diesel Engine: 3050 to 3150 RPM, Gasoline Engine:
3200 RPM).
7. Have second person carefully watch pressure gauge
on tester while slowly closing the flow control valve until
400 PSI (28 bar) is obtained. Verify engine speed with
a phototac.
1 2
Figure 25
1. Charge circuit oil filter
2. Tee fitting
3. Hydraulic hose
3
NOTE: If engine speed drops below specified RPM,
pump flow will decrease. Adjust test specifications ac-
cordingly (see Testing in this chapter).
8. Observe flow gauge. Flow indication should be
approximately 4.5 GPM (17 LPM).
9. Release traction pedal to the neutral position, open
flow control valve on tester and shut off engine. Record
test results.
10.If flow is less than 4 GPM (15 LPM), check for restric-
tion in pump suction line. If suction line is not restricted,
the charge pump in the piston (traction) pump assembly
needs to be repaired or replaced as necessary (see Pis-
ton (Traction) Pump Service in this chapter).
11.When testing is complete, disconnect tester from tee
fitting and machine hydraulic hose. Reconnect machine
hydraulic hose to tee fitting.
12.Start engine and run at low idle speed. Check for hy-
draulic leakage and correct before returning machine to
service.
Hydraulic
System
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