Toro Groundsmaster 328-D, Service Manual

Page: 117 / 402

TEST NO. 3: Traction Pressure (Fig. 10)
Using a high pressure gauge: 0 - 5000 psi
j
Failure to use a high pressure gauge 0 - 5000
psi during this traction pressure test could
result in damage to the gauge and possible
personal in ury due to leaking, hot oil.
CAUTION
1. Before beginning the traction test, drive the machine
to an open area, lower the cutting unit, turn the engine
OFF and engage the parking brake. Connect a chain to
the rear axle. Connect the other end of the chain to an
immovable object and remove all slack from the chain.
2. Place a drain pan on the floor beneath the transmis-
sion. Remove the hex head plug from the transmission.
3. Connect the high pressure hydraulic gauge hose to
the gauge port.
4. Start the engine and allow it to run for approximately
5 minutes so that the hydraulic oil reaches normal
operating temperature.
5. Increase the engine speed to the FULL throttle setting
Figure 10
and use a tachometer to achieve 3200
±
50 rpm.
1. High pressure gauge (0 - 5000 psi)
j
To prevent damage to gauge and possible
personal in ury due to leaking, hot oil, do not
exceed 5000 psi during traction pressure test.
CAUTION
6. Sit on the seat, and with the brakes locked, slowly
depress the top of the traction pedal. While pushing the
top of the traction pedal down, look at the pressure
reading on the gauge. The gauge should show 4000 -
4500 psi. DO NOT exceed 5000 psi.
7. If the traction pressure is lower than 4000 psi, check
the acceleration valves. If the acceleration valves are in
good condition and there is no foreign material in the
ports of the transmission, inspect the charge check
valves. If the charge check valves are in good condition,
overhaul the transmission because either the pump,
motor, or both piston groups are at fault.
Groundsmaster
®
300 Series Page 5 - 21 Testing