Oil Cooler Fan Motor Priority Flow Control Valve; Description; Maintenance; Oil Cooler Fan Motor Priority Flow Control - Manitowoc Grove RT765E-2 Service And Maintenance Manual
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RT765E-2 SERVICE MANUAL
OIL COOLER FAN MOTOR PRIORITY FLOW
CONTROL VALVE
Description
The priority flow control valve is located inside the right frame
rail at the center of the frame. The purpose of the valve is to
insure the oil cooler fan motor gets the priority flow and the
integrated outrigger/rear steer valve circuit receives the
excess flow. Hydraulic pump number 1, section 2 supplies
the priority flow control valve which provides 5.0 gpm (18.9 l/
min) to the hydraulic oil cooler fan motor and the excess flow
to the integrated outrigger/rear steer valve unless the high
speed boost selector valve is energized and then the oil is
combined with the output of pump 1, section 1 to provide
additional oil capacity to the section 1 functions.
Maintenance
NOTE:
Maintenance procedures are limited to the removal
and replacement of the valve.
GROVE
Removal
1.
Tag and disconnect the hydraulic lines attached to the
valve. Cap or plug the lines and ports.
2.
Remove the capscrews, washers, flatwashers and nuts
securing the valve to the valve mounting plate and
remove the valve.
Installation
1.
Place the priority flow control valve on the mounting
plate and secure it with the capscrews, washers,
flatwashers and nuts. Torque capscrews; refer to
Fasteners and Torque Values, page 1-16 for proper
torque value.
2.
Connect the hydraulic lines to the valve as tagged during
removal.
3.
Start the crane and energize the high speed boost and
operate the crane several times. Verify the hydraulic oil
cooler fan motor works properly.
4.
Check for leaks. Make repairs as needed.
Published 9-04-2014, Control # 422-08
HYDRAULIC SYSTEM
2-57
2
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Troubleshooting
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Cummins QSB 6.7 diesel engine not starting
The provided context does not contain specific troubleshooting steps for why the Cummins QSB 6.7 diesel engine in the Manitowoc Grove RT765E-2 might not start. However, common reasons for a diesel engine failing to start include:
1. Fuel Issues – Low or contaminated fuel, clogged fuel filters, or air in the fuel system.
2. Battery Problems – Weak or dead battery preventing proper cranking.
3. Starter Motor Failure – Faulty starter preventing engine turnover.
4. DPF Regeneration Interruption – If the Diesel Particulate Filter (DPF) regeneration was interrupted, it could affect engine performance.
5. Electrical or Sensor Faults – Wiring issues, faulty sensors, or an inactive safety switch.
If the engine does not start, checking these possible causes is recommended.
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Cummins diesel engine QSB 6.7 cranking but failing to start what could be the problem
Possible reasons why a Manitowoc Grove RT765E-2 with a Cummins QSB 6.7 diesel engine is cranking but failing to start could include:
1. Fuel Issues
- Insufficient or contaminated fuel.
- Clogged fuel filter or fuel lines.
- Faulty fuel pump preventing fuel delivery.
2. Air Intake Problems
- Blocked or restricted air filter.
- Turbocharger failure affecting air intake.
3. Electrical Issues
- Weak or faulty battery preventing proper cranking speed.
- Faulty starter motor or wiring connections.
- Malfunctioning engine control module (ECM).
4. Injection System Failure
- Faulty fuel injectors or injection pump.
- Air trapped in the fuel system.
5. Sensor or Control Failures
- Malfunctioning crankshaft or camshaft position sensor preventing proper timing.
- Faulty engine temperature sensor or other control module issues.
6. Low Oil Pressure or Safety Shutoff
- Engine protection systems preventing startup due to low oil pressure or other safety concerns.
Checking fuel supply, air intake, battery condition, and diagnostic codes can help identify the issue.
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