Toro Groundsmaster 5900 Series Service Manual page 144

Procedure for Traction Circuit Relief Pressure Test (continued)
Hydraulic System: Testing
9. If traction relief pressure is low, make sure that bypass (tow) valves in traction
pump are fully seated. Then, inspect traction pump relief valves
52). Clean or replace valves as necessary. These cartridge type valves are
factory set and are not adjustable. If relief valves are in good condition, piston
(traction) pump or wheel motors should be suspected of wear and inefficiency.
Note: Forward and reverse relief valves are identical. Relief valves can be
switched in piston (traction) pump to help in identifying a faulty relief valve.
10. When relief pressure testing is complete, disconnect pressure gauge from
test port.
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(Figure
Groundsmaster ® 5900 & 5910
16227SL Rev B