538 Forest Machine Machine Systems 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 
38000 ± 1000 kPa (5512 ± 145 psi) Engine speed dial "10"
AEC switch OFF 
Item  Specification(1)  Left Travel  Right Travel 
New Travel Motor  15 L/min (4.0 US gpm)  1.  1. 
2. 2.
3. 3.
Rebuilt Travel Motor  18 L/min (4.8 US gpm)  1.  1. 
2. 2.
3. 3.
(1) Maximum acceptable flow

Introduction

Use the following procedure 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 1g02156033
Tooling group (D)


Illustration 2g03330343
( G) 418-3611 Track Block

Table 2
Tool  Item  Qty  Part
Number 
Description 
D1  6V-7788  Flow Meter
5 to 60 L/min (2 US gpm to 15 US gpm) 
D2 8C-6874  Reducer 
D3 6V-9746  O-Ring Seal 
D4 124-1901  Permanent Coupling 
D5 3 ft  122-6870  Bulk Hydraulic Hose 
D6 124-2147  Permanent Coupling 
D7 6V-8942  O-Ring Reducer 
D8 6V-8556  Nut 
D9 6V-8398  O-Ring Seal 
311-1362  Vacuum Cap 
418-3611  Track Block 

Machine Preparation

  1. Position the machine on level ground.


    Illustration 3g03330350
    Sprocket (left travel)
    (G) Track Block
    (1) Sprocket

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

  3. Stop the engine.

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

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


    Illustration 4g02240294
    Flow Meter Tool Layout
    Tooling (D)
    ( 2) Case drain hose
    (3) Connector
    (4) Travel motor

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

  7. Disconnect case drain hose (2) from connector (3).

  8. Connect the flow meter assembly (D) between connector (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).

  9. Remove 311-1362 Vacuum Cap.

Test Procedure

  1. Start the engine.

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

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

  4. Place the machine controls at the following settings: engine speed dial "10" and AEC switch OFF

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

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

  7. Move the left travel lever to reposition the travel motor.

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

  9. Repeat Steps 5 through 8 to obtain three measurements of case drain oil.

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