349F and 352F Excavators Hydraulic System Caterpillar

Travel Motor - Test - Measurement of Case Drain Oil

Usage:

Specification

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Table 1
"Travel Motor - Test (Measurement of Case Drain Oil)"
Machine Settings	Crossover Relief Pressure		Engine Speed
Machine Settings	37500 ± 500 kPa (5440 ± 73 psi)		Engine speed dial "10" AEC switch OFF
Item	Specification⁽¹⁾	Actual
Item	Specification⁽¹⁾	Left Travel	Right Travel
New Travel Motor	38 L/min (10.1 US gpm)	1.	1.
		2.	2.
		3.	3.
Rebuilt Travel Motor	44 L/min (11.6 US gpm)	1.	1.
		2.	2.
		3.	3.

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⁽¹⁾	Maximum acceptable flow

Introduction

Use the following procedure in order to measure the case drain of the travel motors.

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NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products. Dispose of all fluids according to local regulations and mandates.

Required Tools

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Illustration 1	g02148680
Tooling group "D"

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Illustration 2	g03269576

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Table 2
Tool	Item	Qty	Part Number	Description
D	D1	1	6V-7788	Flow Meter 5 to 60 L/min (2 to 15 US gpm)
	D2	1	8C-6874	Connector
	D3	2	6V-9746	O-Ring Seal
	D4	1	124-1921	Permanent Coupling
	D5	1	122-6872	Bulk Hydraulic Hose
	D6	1	124-2153	Permanent Coupling
F		1	311-1362	Vacuum Cap
G		1	418-3612	Track Block

Machine Preparation

Position the machine on level ground.
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Illustration 3 g03369590

Sprocket (forward left travel)
(G) Track Block
(1) Sprocket
Place track block (G) in sprocket (1) in order to block forward left travel. Refer to Illustration 3.
Stop the engine.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure - Release".

Attach 311-1362 Vacuum Cap onto the hydraulic tank. Attach an air supply hose onto the assembly. Apply 276 to 414 kPa (40 to 60 psi). This procedure will pull a vacuum on the hydraulic system.

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Illustration 4	g02144928
Flow Meter Tool Layout (2) Case drain hose (3) Elbow (4) Travel motor (D1) Flow meter (D2) Connector (D3) O-Ring seal (D4) Permanent coupling (D5) Hose (D6) Permanent Coupling

Install the following tools in accordance with the flow meter tool layout. Refer to Illustration 4.
Disconnect case drain hose (2) from elbow (3).
Connect the flow meter assembly (D) between elbow (3) and case drain hose (2).
Note: Correct orientation of the flow meter is necessary. The oil flows from travel motor (4) to case drain hose (2).
Remove 311-1362 Vacuum Cap.

Test Procedure

Start the engine.
Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
Place the hydraulic activation control lever in the UNLOCKED position.
Set the engine speed dial to position "10" and AEC switch "OFF".
Move the left travel lever to full FORWARD position and check the flow of oil through the flow meter. Refer to Table 1.
Remove track block (G) from sprocket (1).
Move the left travel lever in order to reposition the travel motor.
Place track block (G) in sprocket (1) in order to block forward left travel.
Repeat Steps 5 through 8 in order to obtain three measurements of case drain oil.