Manitowoc Grove RT765E-2 Service And Maintenance Manual page 42
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- Operator's manual (156 pages) ,
- Operator's manual (178 pages)
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HYDRAULIC SYSTEM
Description
Manually Operated - Valve shifted
manually with check to allow flow back to
tank.
Pneumatic Operated - Valve shifted by
pneumatic device.
Pilot Operated - Valve shifted by pilot
pressure.
Electric Operated - Valve shifted by
electrical energy.
Brake Valve - Activates swing brake.
Open Center Cylinder Spool - Directional
control valve for hydraulic cylinder
function that directs flow back to tank
through the open center when in the
neutral position
Open Center Motor Spool - Directional
control valve for hydraulic motor function
that directs flow back to tank through the
open center when in the neutral position.
Allows flow back to tank when the crane is
shut down.
Closed Center Cylinder Spool - Pressure
compensated directional control valve for
hydraulic cylinder which directs flow back
to tank with an unloader valve cartridge.
Closed Center Motor Spool - Pressure
compensated directional control valve for
motor with open port for flow back to tank.
Allows flow back to tank when the crane is
shut down.
2-4
Symbol
Single Acting Cylinder - Extended
hydraulically and retracted with a spring.
Double Acting Cylinder - Extended and
retracted hydraulically.
Double Acting Telescope Cylinder - Anchored rod pushes
barrel out when check valve is unseated.
MultiStage Telescope Cylinder - Used in multi/section
synchronized operations.
Inverted Outrigger Jack Cylinder- Extends the barrel
down to raise the crane off the ground.
Holding Valve - Keeps boom lift cylinder
from collapse if hydraulic pressure failure
occurs (i.e. hose rupture).
Pilot Operated Check Valve (with thermal
relief) - Requires pilot pressure to unseat
the one way check (nonadjustable).
Flow Divider Valve - Regulates flow to a
selected circuit.
Hoist Brake - Holds load after control is
returned to neutral (spring applied and
hydraulically released).
Swing Brake - Spring applied
hydraulically brake holds superstructure
in place.
Published 9-04-2014, Control # 422-08
RT765E-2 SERVICE MANUAL
Description
Symbol
- Quick Links:
- Brakes
- Electrical System
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Troubleshooting
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Questions and answers
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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