Procedure for Rear Traction Circuit (RV) Relief Pres- sure Test
1.Make sure hydraulic oil is at normal operating tem- perature by operating the machine for approximately 10 minutes. Make sure the hydraulic tank is full.
2.Park machine on a level surface with the cutting deck lowered and off. Make sure engine is off and the parking brake is engaged.
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.Connect a 1000 PSI (70 bar) gauge to test port on 4WD control manifold under radiator (Fig. 26).
4.After installing pressure gauge, start engine and run at idle speed. Check for hydraulic leakage and correct before proceeding with test.
5.Operate the engine at full engine speed (2870 RPM).
6.Operate the machine in 4WD (not transport speed) with the cutting deck lowered. Drive down a slope in a forward direction, decrease pressure on the traction pedal and monitor the pressure gauge. Pressure should increase until the relief valve (RV) lifts. Record test re- sults.
GAUGE READING TO BE 750 PSI (52 bar) (approximate).
7.Relief valve (RV) is located on the lower, front side of the 4WD control manifold (Fig. 27). Adjustment of the relief valve can be performed as follows:
NOTE: Do not remove the relief valve from the hy- draulic manifold for adjustment.
A.To increase relief pressure setting, remove cap on relief valve and turn the adjustment socket on the relief valve in a clockwise direction. A 1/8 turn on the socket will make a measurable change in relief pres- sure (Fig. 28).
B.To decrease pressure setting, remove cap on re- lief valve and turn the adjustment socket on the relief valve in a counterclockwise direction. A 1/8 turn on the socket will make a measurable change in relief pressure (Fig. 28).
C.Recheck relief pressure and readjust as needed.
8.When testing is completed, disconnect pressure gauge from test port.
1
2
Figure 26
1.4WD control manifold
2.Relief valve test port
2 HydraulicSystem
1
Figure 27
1. Manifold: lower side | 2. Relief valve (RV) |
1
2
| Figure 28 |
1. Relief valve cap | 2. Adjustment socket |
Groundsmaster | Page 4 | Hydraulic System |
