Toro Multi Pro 5800 Service Manual page 69

The traction circuit charge pressure test should be per-
formed to make sure that the traction charge circuit is
functioning correctly.
Procedure for Traction Circuit Charge Pressure
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. Thoroughly clean test port on tee fitting at front of
charge circuit oil filter under the hydraulic reservoir.
Install 1000 PSI (70 bar) pressure gauge to test port fit-
ting.
4. After installing pressure gauge, start engine and run
at low idle speed. Check for hydraulic leakage and cor-
rect before proceeding with test.
5. Operate the engine at high idle engine speed (3050
to 3150 RPM) with no load on the traction circuit (trac-
tion pedal in the neutral position).
GAUGE READING TO BE 250 to 300 PSI (17 to 21
bar)
6. Stop engine and record test results.
7. If there is no pressure or pressure is low, check for
restriction in pump suction line. Also, inspect charge re-
lief valve located in charge pump adapter on piston
pump (see Piston (Traction) Pump Service in the Ser-
vice and Repairs section of this chapter). If necessary,
check for internal damage or worn parts in charge pump.
Multi Pro 5800
8. Next, with the pressure gauge still connected to the
test fitting on oil filter, take a pressure reading while op-
erating the machine in forward and reverse. Start the en-
gine and put throttle at high idle engine speed (3050 to
3150 RPM). Apply the brakes and push the traction ped-
al forward while monitoring the pressure gauge. Repeat
for reverse direction.
GAUGE READING TO BE 250 to 300 PSI (17 to 21
bar)
9. Stop engine and record test results.
10.If charge pressure is good under no load (step 5
above), but consistently drops more than 15% when un-
der traction load, the piston (traction) pump and/or rear
wheel motor(s) should be suspected of wear and ineffi-
ciency. When the piston pump and/or wheel motor(s)
are worn or damaged, the charge pump is not able to
keep up with internal leakage in traction circuit compo-
nents.
11. After testing is completed, disconnect pressure
gauge from piston pump and reinstall plug to auxiliary
test port.
1
1. Charge circuit oil filter
Page 4 - - 31
2
Figure 24
2. Test port
Hydraulic System