Multi Pro 5700 - Toro
Multi Pro 5700 - Toro
Multi Pro 5700 - Toro
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Gear Pump Flow Test<br />
Output from the gear pump is divided by a priority flow<br />
divider to allow priority flow to the steering circuit and<br />
secondary flow to the spray pump drive circuit. To test<br />
gear pump flow, testing of both circuits is required. Total<br />
gear pump flow is the combined flow from the two circuits.<br />
If a problem is suspected in one of the two circuits,<br />
flow for that circuit should be measured to determine if<br />
the problem is pump related or is involved with other circuit<br />
components.<br />
1. Make sure hydraulic oil is at normal operating temperature<br />
by operating the machine for approximately 10<br />
minutes. Make sure the hydraulic tank is full.<br />
2. Park machine on a level surface, stop engine, engage<br />
parking brake, and remove key from the ignition<br />
switch. After turning engine off, operate all hydraulic<br />
controls to relieve hydraulic system pressure.<br />
CAUTION<br />
Prevent personal injury and/or damage to equipment.<br />
Read all WARNINGS, CAUTIONS, and Precautions<br />
for Hydraulic Testing at the beginning<br />
of this section.<br />
IMPORTANT: Make sure that the oil flow indicator<br />
arrow on the flow meter is showing that the oil will<br />
flow from the pump, through the tester, and into the<br />
hydraulic hose.<br />
3. With the engine off, clean hose fitting and disconnect<br />
one of the circuit pressure hoses from the gear pump<br />
(Fig. 16). Install tester with pressure gauges and flow<br />
meter in series between the gear pump and the disconnected<br />
hose. Make sure the tester flow control valve<br />
is open.<br />
6. While watching tester pressure gauges, slowly close<br />
flow control valve on the tester until 800 PSI is obtained<br />
on gauge. Verify engine speed continues to be within<br />
spec. Record flow meter reading.<br />
GAUGE READING TO BE: For steering circuit, flow<br />
should be approximately 3 GPM at 800 PSI. For<br />
spray motor circuit, flow should be approximately 9.5<br />
GPM at 800 PSI.<br />
7. Open tester flow control valve and stop engine.<br />
NOTE: Relief pressure for steering and/or spray pump<br />
drive circuits can be determined with the tester positioned<br />
as described in this test.<br />
8. Remove tester and reinstall disconnected hose.<br />
Complete steps 3 through 6 for other circuit hose.<br />
9. If the total of the two flows is less than 12.5 GPM or<br />
a pressure of 800 PSI could not be obtained, check for<br />
restriction in pump suction line. If suction line is not restricted,<br />
remove gear pump and repair or replace as<br />
necessary.<br />
If the total of the two flows is 12.5 GPM but individual circuit<br />
flow is incorrect (e.g. steering circuit has 6 GPM and<br />
spray motor circuit has 6.5 GPM), suspect a problem<br />
with one of circuits or with the priority flow divider in the<br />
gear pump.<br />
Hydraulic<br />
System<br />
4. After installing tester, start engine and run at idle<br />
speed. Check for hydraulic leakage and correct before<br />
proceeding with test.<br />
1<br />
2<br />
IMPORTANT: The gear pump is a positive displacement<br />
type. If pump flow is completely restricted or<br />
stopped, damage to the gear pump, tester, or other<br />
components could occur.<br />
5. Operate the engine at high idle speed (3050 – 3150<br />
RPM). Verify engine speed with a phototac.<br />
Figure 16<br />
1. Steering circuit pressure hose<br />
2. Spray motor circuit pressure hose<br />
<strong>Multi</strong> <strong>Pro</strong> <strong>5700</strong>–D Page 4 – 19 Hydraulic System
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