349E Excavator Hydraulic System Travel Motor - Test - Measurement of Case Drain Oil Caterpillar


Travel Motor - Test - Measurement of Case Drain Oil
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1.1. Specification
2.1. Introduction
3.1. Required Tools
4.1. Machine Preparation
5.1. Test Procedure

Specification

Table 1
"Travel Motor - Test (Measurement of Case Drain Oil)"    
Machine Settings     Crossover Relief Pressure     Engine Speed    
38200 ± 500 kPa (5540 ± 73 psi) Engine speed dial "10"
AEC switch OFF    
Item     Specification (1)     Actual    
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.
( 1 ) Maximum acceptable flow

Introduction

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


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




Illustration 1g02148680

Tooling group "D"




Illustration 2g03269576

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

  1. Position the machine on level ground.



    Illustration 3g03369590

    Sprocket (forward left travel)

    (G) Track Block

    (1) Sprocket

  1. Place track block (G) in sprocket (1) in order to block forward left travel. Refer to Illustration 3.

  1. Stop the engine.

  1. Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure - Release".

  1. 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.



    Illustration 4g02144928

    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

  1. Install the following tools in accordance with the flow meter tool layout. Refer to Illustration 4.

  1. Disconnect case drain hose (2) from elbow (3) .

  1. 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) .

  1. Remove 311-1362 Vacuum Cap .

Test Procedure

  1. Start the engine.

  1. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

  1. Place the hydraulic activation control lever in the UNLOCKED position.

  1. Set the engine speed dial to position "10" and AEC switch "OFF".

  1. Move the left travel lever to full FORWARD position and check the flow of oil through the flow meter. Refer to Table 1.

  1. Remove track block (G) from sprocket (1) .

  1. Move the left travel lever in order to reposition the travel motor.

  1. Place track block (G) in sprocket (1) in order to block forward left travel.

  1. Repeat Steps 5 through 8 in order to obtain three measurements of case drain oil.

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