PLATE 8D9057 - 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.
Specifications
Table 1
D6T Pressure Test for the Transmission Lubrication Oil
Date Equipment ID Code
Item Specification Actual
High Idle (L1) (with lube control system disabled) 180 35 kPa (26 5 psi)
High Idle (L1) (with lube control system enabled) 125 35 kPa (18 5 psi)
Low Idle (L1) 16 11 kPa (2.3 1.5 psi) Introduction
The following test will determine whether the pressure of the transmission lubrication oil is at the specified limit. This oil is delivered from the power train oil cooler to the lubrication manifold.Required Tools
Illustration 1 g02571852
Tooling (A)
Table 2
Required Tools
Tooling Item Part
Number Description QTY
A 198-4240 Digital Pressure Indicator Group
A1 198-4234 Digital Pressure Indicator 1
A2 198-4237 Pressure Sensor (0 psi to 500 psi) 1
A3 198-4236 Adapter Cable Assembly 1 Test Preparation
Move the machine to a smooth horizontal location.
Lower all the implements. Engage the parking brake. Turn the engine OFF.
Illustration 2 g06001999
Locate pressure port for the transmission lubrication
(L1) Pressure Port for the Transmission Lubrication
(P) Pressure Port for the Main Relief Valve
Locate pressure port (L1) on the machine. Pressure port (L1) is on the back of the transmission housing.
Attach tooling (A) to pressure port (L1).Test Procedure
Start the engine. Warm the power train oil to a temperature of 80° 5°C (176° 9°F).
Operate the engine at HIGH IDLE. Disengage the parking brake. Make sure that the steering control lever is in the NEUTRAL position.
Check the pressure at tooling (A). The correct pressure should be 125 35 kPa (18 5 psi).
Operate the engine at LOW IDLE. Disengage the parking brake. Make sure that the steering control lever is in the NEUTRAL position.
Check the pressure at tooling (A). The correct pressure should be 16 11 kPa (2.3 1.5 psi).