MODULE-HEATER 7E5561 - Caterpillar

Hydraulic oil pressure can remain in the hydraulic system on this machine after the engine and pump have been stopped. Serious injury can result if this pressure is not released before any service is done on the hydraulic systems. In order to prevent possible injury, release the hydraulic system pressure before working on any fitting, hose, or hydraulic component.Lower all attachments to the ground before service is started. If the hydraulic system must be serviced, tested, or adjusted with the attachment in the raised position, the attachments and lift cylinders must be supported properly.Always move the machine to a location away from the travel of other machines. Be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being made.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Dispose of all fluids according to local regulations and mandates.
Introduction
This test will show the following conditions if the conditions exist:
The oil pressure to the transmission lubrication circuit is good.
The relief valve for the transmission oil cooler is closed.The pressure for the lubrication of the transmission is not adjustableRequired Tooling
Illustration 1 g02689576
Digital Pressure Indicator Group (A)
Table 1
Tool Item Qty Part No Description
A 198-4240 Digital Pressure Indicator Gp
A1 1 198-4234 Digital Indicator
A2 1 198-4237 Pressure Sensor Gp
(0 to 3,445 kPa (0 to 500 psi))
A3 1 198-4236 Adapter Cable As Machine Preparation
Move the machine to a smooth horizontal location. Move away from any machines that are working and any personnel.
Move the transmission control to the NEUTRAL position. Fully raise the dump body of the truck.
Activate the parking brakes. Stop the engine.
Permit only one operator on the machine. Either keep other personnel away from the machine, or keep other personnel in the sight of the operator.
Place blocks in front of the wheels and behind the wheels.
Install the retaining pin for the dump body.
Make sure that the transmission is in the NEUTRAL position.
Make sure that all air pressure and oil pressure is released before any fittings, hoses, or components are worked on.
Push the brake pedal many times until there is no brake pressure. Test Procedure
Note: Make sure that the filters and the screens are clean before you test any pressures. Make sure that the oil is at operating temperature before you perform this test.
Illustration 2 g02635496
View of the left side of the transmission
(1) Pressure tap for the lubrication of the transmission
Connect Tooling (A) to the nipple at pressure tap (1).
Start the engine while the parking brakes are engaged. Run the engine at the low idle rpm while the transmission is in NEUTRAL.
Record