621H, 623H and 627H Wheel Tractor-Scrapers Power Train Caterpillar

Transmission Lubrication Oil Pressure - Test

Usage:

623H DBF

Specifications

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Table 1
Transmission Lubrication Pressure
Date	Equipment ID Code
	Lubrication Pressure		Actual
Low Idle	5 kPa (1 psi) to 62 kPa (9 psi)
High Idle	100 kPa (15 psi) to 275 kPa (40 psi)

Introduction

This test will determine the following conditions.

The oil pressure to the transmission lubrication circuit is good.
The oil pressure to the transmission lubrication circuit is good during the retarder operation.

Required Tools

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Illustration 1	g02571852
Tooling (A) 198-4240 Digital Pressure Indicator Gp

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Table 2
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

Test Preparation

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Illustration 2	g02607480
Left Side of Transmission (1) Pressure tap for transmission lubrication

At pressure tap (1), connect Tooling (A).

Test Procedure

With the parking brake engaged, start and operate the engine at LOW IDLE rpm with the transmission in NEUTRAL. The pressure on the gauge should read 5 kPa (1 psi) to 62 kPa (9 psi).
With the transmission in NEUTRAL, operate the engine at HIGH IDLE rpm. The pressure on the gauge should be between 100 kPa (15 psi) to 275 kPa (40 psi).

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