Grove Published 11-22-2016, Control # 345-12 2-25
RT9130E-2 SERVICE MANUAL HYDRAULIC SYSTEM
Procedure E - For Checking Service Brake
Dual Accumulator Charge Valve Pressure
Limits
1. With the engine off, discharge all of the pressurized oil
stored in the accumulators by depressing the service
brake pedal on the cab floor 4-6 times.
2. Install a pressure gauge at the service brake dual
accumulator charge valve “A1” pressure test port
(Figure 2-10).
3. Start the engine. The charging valve will immediately
start to charge the accumulators. Watch the pressure
gauge. The high charge limit pressure should read 2490
+72/-145 psi (17 +.5/-1 MPa) when the pressure gauge
stops rising.
4. With the engine still running at idle, repeatedly depress
the service brake pedal. As the pressure approaches
2250 psi (15.5 MPa). Pay close attention as the next
application should make the valve start recharging.
Watch the pressure gauge, the pressure should be 2100
+145/-145 psi (14.5 ± 1.0 MPa) when it starts to
recharge.
5. Turn the engine off, remove diagnostic connector with
gauge from test nipple.
Item Description
1 Accumulator A1 Pressure Test Port
2 Pressure “P” Port
3 Tank Port
4 Socket Head Screw Adjustment
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