Procedure for Counterbalance 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. Remove console cover.
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.Determine system charge pressure (see Traction Circuit Charge Pressure in this chapter).
4.Connect a 1000 PSI (70 bar) gauge to counterbal- ance test port on manifold under console (Fig. 25).
5.After installing pressure gauge, start engine and run at idle speed. Check for hydraulic leakage and correct before proceeding with test.
6.Operate the engine at full engine speed (2870 RPM) with no load on the system. Do not engage the cutting deck.
GAUGE READING TO BE 225 PSI (15.5 bar) over system charge pressure (e.g. if charge pressure is 250 PSI (17.2 bar), counterbalance pressure should be 475 PSI (32.7 bar)).
7.Stop the engine and record test results.
8.Adjustment of the counterbalance valve can be per- formed as follows:
NOTE: Do not remove the counterbalance valve from the hydraulic manifold for adjustment.
A. Loosen locknut on counterbalance valve (Fig. 25).
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 counterbalance 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 counterbalance pressure.
D.Tighten locknut to secure adjustment. After ad- justment, recheck counterbalance pressure. Re- adjust as needed.
9.When testing is completed, disconnect pressure gauge from test port.
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Figure 25
1. | Counterbalance test port | 3. | Locknut |
2. | Counterbalance valve | 4. | Adjusting screw |
Hydraulic System
Groundsmaster | Page 4 | Hydraulic System |
