Procedure for Steering Circuit Relief 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 5000 PSI (350 bar) gauge onto steering circuit pressure test port (Fig. 39).
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).
IMPORTANT: Hold steering wheel at full lock only long enough to get a system pressure reading. Holding the steering wheel against the stop for an extended period will damage the steering motor.
6.Turn steering all the way in one direction and mo- mentarily hold the steering wheel against resistance.
GAUGE READING TO BE 1300 to 1400 PSI (90 to
96bar).
7.Stop the engine and record test results.
8.If pressure is incorrect, inspect steering relief valve in control valve (Fig. 40). If steering relief valve is operat- ing properly and if lift/lower problems also exist, gear pump should be suspected of wear and inefficiency. If steering wheel continues to turn at end of cylinder travel (with lower than normal effort), steering cylinder or steering valve should be suspected of wear or damage.
9.When testing is completed, disconnect pressure gauge from test port.
1
Figure 39 |
|
1. Steering circuit pressure test port |
|
1 | Hydraulic System |
| |
2 |
|
Figure 40
1. Steering tower | 2. Steering relief valve |
Groundsmaster | Page 4 | Hydraulic System |
