Toro Multi Pro 5800 Service Manual page 89

Over a period of time, the gears and wear plates in the
gear pump can wear. A worn pump will by-pass oil and
make the pump less efficient. Eventually, enough oil can
by-pass to cause circuit performance problems. Contin-
ued operation with a worn, inefficient pump can gener-
ate excessive heat and cause damage to seals and
other components in the hydraulic system.
Procedure for Spray Pump Circuit Gear Pump Flow
Test:
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. With the engine off, clean fitting and hydraulic hose
on left side of front gear pump section (Fig. 37). Discon-
nect hydraulic hose from the fitting.
IMPORTANT: Make sure that the oil flow indicator
arrow on the flow meter is showing that the oil will
flow from the pump, through the tester and into the
hydraulic hose.
4. Install tester with pressure gauge and flow meter in
series between the fitting and the disconnected hose.
Make sure the tester flow control valve is open.
5. After installing tester, start engine and run at low idle
speed. Check for hydraulic leakage and correct before
proceeding with test.
IMPORTANT: The gear pump is a positive displace-
ment type. If pump flow is completely restricted or
stopped, damage to the gear pump, tester or other
components could occur.
Multi Pro 5800
6. Operate the engine at high idle speed (3050 to 3150
RPM). Verify engine speed with a phototac.
7. Carefully watch pressure gauge on tester while slow-
ly closing the flow control valve until 800 PSI (56 bar) is
obtained. Verify with a phototac that the engine speed
is still 3050 to 3150 RPM.
NOTE: If engine speed drops below 3050 RPM, pump
flow will decrease.
8. Observe flow gauge. Flow indication should be
approximately 12 GPM (46 LPM).
9. Open tester flow control valve and stop engine. Re-
cord test results.
10.If the flow is less than 10.8 GPM (41 LPM) or a pres-
sure of 800 PSI (56 bar) could not be obtained, check
for restriction in gear pump suction line. If suction line is
not restricted, remove gear pump, inspect pump and re-
pair pump as necessary (see Gear Pump and Gear
Pump Service in the Service and Repairs section of this
chapter).
11. After testing is completed, remove tester and rein-
stall disconnected hose.
3
1. Gear pump
2. Spray pump circuit pressure hose
3. Fitting (front gear pump section)
Page 4 - - 51
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Figure 41
Hydraulic System
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