Oil Cooler; Description; Oil Temperature Switches - Manitowoc Grove RT765E-2 Service And Maintenance Manual
Hide thumbs
Also See for Grove RT765E-2:
- Operator's manual (156 pages) ,
- Operator's manual (178 pages)
Table of Contents
Advertisement
RT765E-2 SERVICE MANUAL
OIL COOLER
Description
An air cooled hydraulic/transmission cooler (Figure 2-3) is
located next to the hydraulic tank. The front section is the
transmission oil cooler and the rear section is the hydraulic
oil cooler.
The hydraulic driven fan pulls cool air through the cooling
fins on the cooler. Normally most hydraulic oil from
components is routed through the oil cooler by way of a
return line, and on to the filter in the reservoir. When several
hydraulic functions are being used at one time (i.e., hoisting,
lifting, and telescoping), more oil has to flow through this
return line, causing a pressure buildup. When this pressure
reaches 15 psi (100 kPa), the normally closed check valve in
the return line (in parallel with the return line through the
hydraulic oil cooler) will open, letting some hydraulic oil
bypass the hydraulic oil cooler and flow directly into the
reservoir filter.
When fewer functions are being used, the pressure in the
system will decrease below 15 psi 100 kPa and the check
valve will close again.
Oil Temperature Switches
A hydraulic oil high temperature indicator switch (4),
Figure 2-1 and two oil cooler fan motor temperature switches
GROVE
(6 and 7) are installed in the return tube. The two oil cooler
fan motor temperature switches are normally closed at low
oil temperatures. When the hydraulic oil temperature
reaches 120 °F (48.9 °C), one of the oil cooler fan motor
temperature switch will open, causing the CANbus system to
turn on the oil cooler fan motor to its low rpm setting. When
the hydraulic oil temperature reaches 180 °F (82.2 °C), the
other oil cooler fan motor temperature switch will open,
causing the CANbus system to increase the rpm of the oil
cooler fan motor to high. The hydraulic oil high temperature
indicator switch is normally closed and will open when the
hydraulic oil temperature reaches 190 °F (87.8 °C), causing
the CANbus system to turn on the hydraulic oil high
temperature indicator in the gauge cluster to alert the
operator to the condition.
Temperature switch (5, Figure 2-3), located in the inlet tube
of the transmission oil cooler, is part of a circuit that will alert
the operator to a high transmission oil temperature condition.
The switch is normally closed and will open and cause the
circuit to lose ground when the transmission oil temperature
exceeds 200°F (93°C). When the circuit loses ground, the
CAN bus system will turn on power to illuminate the
Transmission Warning Indicator in the gauge display in the
operator's cab. See Section 3 - Operating Controls and
Procedures, in the Operator's Manual for details of the
Transmission Warning Indicator.
Published 9-04-2014, Control # 422-08
HYDRAULIC SYSTEM
2-15
2
- Quick Links:
- Brakes
- Electrical System
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
Need help?
Do you have a question about the Grove RT765E-2 and is the answer not in the manual?
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.
This answer is automatically generated
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.
This answer is automatically generated