HYDRAULIC SYSTEM RT540E SERVICE MANUAL
2-20 Published 4-20-2015, Control # 502-01
Procedure C - Checking/Setting the Swing
Directional Control Valve Work Port Relief
Valves
1. With engine off, Install a pressure check diagnostic
coupler with gauge onto test nipple at GP1 port of the
accessory manifold with swing directional control valve
(Figure 2-9).
2. Start engine, throttle up to full RPM. With the swing
house lock engaged, swing full right and hold controller.
Adjust the “B” port work port relief “in” to increase or
“out” to decrease so that a gauge pressure reading of
14.5 - 16.9 MPa (2100 - 2450 psi) is achieved.
3. Repeat step #2 for swing left adjusting the “A” port relief.
Procedure D - Checking/Setting the Service
Brake Dual Accumulator Charge Valve
Charging Limits
1. With engine off, discharge all of the pressurized fluid
stored in the accumulators by depressing the service
brake pedal on the cab floor 8 - 10 times.
2. Install a pressure check diagnostic quick disconnects
with gauge onto test nipple at GP7 port of the main
directional control valve (Figure 2-10).
3. Start engine and idle. The charging valve will
immediately start to charge the accumulators. Watch the
pressure gauge. The high charge limit should read 17.4
MPa +0.5- 1.00 (2320 +72, -145 psi) when the pressure
stops rising. This accumulator charge valve is non-
adjustable.
4. With the engine still at idle, repeatedly depress the
service brake pedal on the cab floor until the gauge
pressure reads approximately 13.5 ± 1.00 MPa (1950 ±
145 psi) when it starts to recharge. Once you have found
this pressure, push the brake pedal again to recharge.
Watch the gauge and verify the low charging limit to be
13.5 ± 1.00 MPa (1950 ± 145 psi) (when it starts to
recharge). This accumulator charge valve is non-
adjustable.
5. Stop engine. Remove pressure gauge.
Procedure E - Checking/Pre-Charging the
Service Brake Accumulators
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. Remove the gas
valve guard and cap on the accumulator (Figure 2-13)
2. Before attaching the gas charging assembly
(Figure 2-13) onto the gas valve, back the gas chuck “T”
handle all the way out (counterclockwise).
3. Close the charging assembly bleed valve. Attach the
swivel nut onto the gas valve and tighten 1.1 - 1.6 Nm
(10-15 lb-in).
4. Turn the gas chuck “T” handle all the way down
(clockwise) which will depress the core in the gas valve
5. Check the pre-charge pressure. The gauge should read
5.5 +0.4, -0 MPa (800 +50, -0 psi).
6. If the pressure is 5.5 +0.4, -0 MPa (800 +50, -0 psi),
remove the charging valve assembly by turning the “T”
handle all the way out on the gas chuck and then
opening the bleed valve (Figure 2-13).
7. Secure the gas valve, loosen the swivel nut and remove
the charging assembly. Replace the gas valve cap and
guard.
Procedure For Pre-charging the Accumulator, If required
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. Remove the gas
valve and cap on the accumulator (Figure 2-12).
2. Ensure the nitrogen supply bottle is shut off, then attach
the charging valve assembly to it.
3. Before attaching the charging assembly to the
accumulator gas valve, back the gas chuck “T” handle
all the way out (counterclockwise).
4. Close the charging assembly bleed valve. Without
looping or twisting the hose, attach the swivel nut to the
accumulator gas valve and tighten 1.1 - 1.6 Nm (10-15
lb-in).
5. Turn the gas check “T” handle al the way down
(clockwise) which will depress the core in the gas valve.
6. Slowly open the nitrogen bottle valve and fill the
accumulator. Close the valve when the pre-charge is 5.5
+0.4, -0 MPa (800 +50, -0 psi).
7. If the precharge is higher than specified in step #6, close
the nitrogen bottle and slowly open the bleed valve on
the charging assembly (Figure 2-12) until the pressure is
to specification.
8. Remove the charging valve assembly by turning the “T”
handle all the way out (counterclockwise) on the gas
check and then open the bleed valve.
9. Secure the gas valve, loosen the swivel nut and remove
the charging assembly. Replace the gas valve cap and
guard.
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