Procedure for Cutting Deck Manifold 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.Locate deck manifold to be tested (Fig. 34). Discon- nect hydraulic hose at deck manifold port (M1).
NOTE: An alternative to using manifold port (M1) would be to disconnect the inlet hydraulic hose at deck motor.
4.Install tester with pressure gauges and flow meter in series with the the disconnected hose and hydraulic manifold port (M1) (or motor inlet if hose was discon- nected at deck motor).
5.Make sure the flow control valve on tester is fully open.
6.After installing tester, start engine and run at idle speed. Check for hydraulic leakage and correct before proceeding with test.
CAUTION
Keep away from deck during test to prevent per- sonal injury from the cutting blades.
11.If specification is not met, adjust or clean relief valve in deck manifold port (RV1). Adjust relief valve as fol- lows:
NOTE: Do not remove valve from the hydraulic manifold for adjustment.
A.Remove cap on relief valve with an allen wrench.
B.To increase pressure setting, turn the adjust- ment screw on the valve in a clockwise direction. A 1/8 turn on the screw will make a measurable change in relief pressure.
C.To decrease pressure setting, turn the adjust- ment screw on the valve in a counterclockwise direc- tion. A 1/8 turn on the screw will make a measurable change in relief pressure.
D.Install and tighten cap to secure adjustment. Re- check relief pressure and readjust as needed.
12.Disconnect tester from manifold and hose. Recon- nect hydraulic hose that was disconnected for test pro- cedure.
| 3 | TO OIL COOLER |
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RIGHT | 1 |
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FRONT |
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Figure 34
1. | Center deck manifold | 3. RH wing deck manifold |
2. | LH wing deck manifold |
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Hydraulic System
7.Operate engine at full speed (2870 RPM). Engage the cutting deck.
8.Watch pressure gauge carefully while slowly closing the flow control valve to fully closed.
9.As the relief valve lifts, system pressure should be approximately:
2900 to 3100 PSI (200 to 213 bar) for the center deck and LH wing deck
1900 to 2100 PSI (131 to 144 bar) for the RH wing deck
10.Disengage cutting deck. Shut off engine and record test results.
FRONT DECK MANIFOLD SHOWN |
1 |
2 |
3 |
Figure 35
1. | Deck manifold | 3. Relief valve cap |
2. | Relief valve |
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Groundsmaster | Page 4 | Hydraulic System |
