Procedure for Traction Circuit Reducing Valve (PR) Pressure 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. 29).
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). Make sure that transport/4WD switch is in the 4WD posi- tion.
6.Sit on seat, apply brakes fully and slowly depress the traction pedal in the reverse direction. While pushing traction pedal, look at pressure reading on gauge:
GAUGE READING TO BE 650 PSI (45 bar)
(approximate).
7.Stop engine and record test results.
8.Pressure reducing valve (PR) is located on the front side of the 4WD control manifold (Fig. 30). Adjustment of this valve can be performed as follows:
NOTE: Do not remove the pressure reducing valve from the hydraulic manifold for adjustment.
A.To increase pressure setting, remove cap on re- ducing valve and turn the adjustment socket on the valve in a clockwise direction. A 1/8 turn on the sock- et will make a measurable change in pressure set- ting.
B.To decrease pressure setting, remove cap on re- ducing valve and turn the adjustment socket on the valve in a counterclockwise direction. A 1/8 turn on the socket will make a measurable change in pres- sure setting.
C. Recheck reducing valve (PR) pressure setting and readjust as needed.
9.Disconnect pressure gauge from test port.
1
2
Figure 29
1.4WD control manifold
2.Pressure test port
1 |
2 |
Figure 30
1. Manifold: front side | 2. Reducing valve (PR) |
Hydraulic System
Groundsmaster | Page 4 | Hydraulic System |
