caution - Toro
caution - Toro
caution - Toro
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Procedure for Traction Circuit Relief Pressure Test<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 />
CAUTION<br />
Move machine to an open area, away from people<br />
and obstructions.<br />
2. Drive machine to an open area, lower cutting deck,<br />
turn the engine off and engage the parking brake.<br />
9. When testing is completed, disconnect pressure<br />
gauge from test port.<br />
2<br />
Figure 22<br />
1. Forward traction port 2. LH front tire<br />
1<br />
CAUTION<br />
Prevent personal injury and/or damage to equipment.<br />
Read all WARNINGS, CAUTIONS and Pre<strong>caution</strong>s<br />
for Hydraulic Testing at the beginning<br />
of this section.<br />
3. Connect a 10,000 PSI (700 bar) gauge to traction circuit<br />
test port for function to be checked (Forward or Reverse:<br />
Fig. 22 or 23).<br />
1<br />
2<br />
Hydraulic<br />
System<br />
4. After installing pressure gauge, start engine and run<br />
at idle speed. Check for hydraulic leakage and correct<br />
before proceeding with test.<br />
Figure 23<br />
1. Reverse traction port 2. RH front tire<br />
5. Operate the engine at full speed (2870 RPM).Make<br />
sure that transport/4WD switch is in the transport position.<br />
6. Sit on seat, apply brakes fully and slowly depress the<br />
traction pedal in the appropriate direction. While pushing<br />
traction pedal, look at pressure reading on gauge:<br />
RIGHT<br />
FRONT<br />
2<br />
GAUGE READING TO BE:<br />
Forward: 3750 to 4250 PSI (259 to 293 bar)<br />
Reverse: 4750 to 5250 PSI (328 to 362 bar)<br />
7. Release traction pedal and stop engine. Record test<br />
results.<br />
8. If traction pressure is too low, inspect traction pump<br />
relief valves (Fig. 24). Clean or replace valves as necessary.<br />
These cartridge type valves are factory set and are<br />
not adjustable. If relief valves are in good condition, traction<br />
pump or wheel motors should be suspected of wear<br />
and inefficiency.<br />
NOTE: Seal leakage across pilot directional valves<br />
PD1 and PD2 in 4WD manifold can also cause low forward<br />
traction pressure with reverse pressure meeting<br />
specifications.<br />
1. Forward relief valve<br />
2. Reverse relief valve<br />
Figure 24<br />
1<br />
3. Traction pump<br />
3<br />
Groundsmaster 4100--D<br />
Page 4 - 35<br />
Hydraulic System
Change language