Toro Groundsmaster 5900 Series Service Manual page 161

Procedure for Lift/Lower Circuit Relief Pressure Test (continued)
Groundsmaster ® 5900 & 5910
16227SL Rev B
g287779
1. Steering/lift manifold
2. Test fitting (port G1)
5. Connect a 350 Bar (5000 PSI) pressure gauge with hydraulic hose attached
to test fitting in port G1 on steering/ deck lift manifold
gauge hose to allow operator to view the gauge.
6. After installing pressure gauge, start engine and run at idle speed. Check for
hydraulic leakage and correct before proceeding with test.
7. Sit on the seat and operate the engine at full speed (2530 RPM).
8. While sitting on the seat, press and hold one of the deck lift switches to fully
raise a cutting deck. Momentarily hold the switch with the deck fully raised
while watching the pressure gauge.
9. As the lift/lower relief valve (RV2) lifts, system pressure should be
approximately:
GAUGE READING TO BE: 114 to 145 bar (1650 to 2100 PSI)
10. After relief pressure is identified, release lift switch, stop engine and record
test results.
Lift/Lower circuit relief pressure is affected by both counterbalance
pressure adjustment and spring pressure of the LC valve in the
steering/deck lift manifold. If lift/lower circuit relief pressure is
incorrect, consider that counterbalance pressure or an issue with
the LC valve is affecting lift/lower circuit relief pressure.
Note: Do not remove relief valve (RV2) from the hydraulic manifold for
adjustment.
11. If lift/lower relief pressure is too high, adjust the relief valve (RV2) in the
steering/deck lift manifold so that relief pressure is correct (see
Manifold Relief Valves (page
top of the steering/ deck lift manifold
3
2
Figure 67
3. Relief valve RV2
IMPORTANT
5–72)). The relief valve (RV2) is located on the
(Figure
Page 5–61
1
(Figure 67). Route
Adjust
67).
Hydraulic System: Testing