330D, 336D and 340D Excavators Hydraulic System – Travel Motor – Test – Measurement of Case Drain Oil

Specification

Note: Certain machines will default to “Economy Mode” at machine startup. Change to “High Hydraulic Power Mode” before performing the test procedure.

Table 1
“Travel Motor – Test (Measurement of Case Drain Oil)”    
Machine Settings     Crossover Relief Pressure     Engine Speed    
36800 ± 1500 kPa (5340 ± 220 psi) Engine speed dial “10”
AEC switch OFF    
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     38 L/min (10.1 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 1 g02571852

Tooling (A)

198-4240 Digital Pressure Indicator Gp

Illustration 2 g02709177

Tooling group (D)

Table 2
Required Tools    
Tool     Item     Qty     Part
Number    		 Description    
A         198-4240     Digital Pressure Indicator Gp    
    A1     1     198-4234     Indicator    
A2 1     198-4237     Pressure Sensor

3447 kPa (500 psi)    
A2 1     198-4239     Pressure Sensor

41,368 kPa (6,000 psi)    
A3 2     198-4236     Extension Cable    
D     D1     1     6V-7788     Flow Meter

5 to 60 L/min (2 to 15 US gpm)    
D2 1     8C-6874     Reducer    
D3 1     6V-9746     O-Ring Seal    
D4 1     124-1901     Permanent Coupling    
D5 3 ft     122-6870     Bulk Hydraulic Hose    
D6 1     124-2147     Permanent Coupling    
D7 1     6V-8942     O-Ring Reducer    
D8 1     6V-8556     Nut    
D9 1     6V-8398     O-Ring Seal    
F     1     311-1362     Vacuum Cap    
G     1     418-3612     Track Block    

Machine Preparation

  1. Position the machine on level ground.

    Illustration 3 g03267696

    Sprocket (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, “Hydraulic 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 4 g02240294

    Flow Meter Tool Layout

    Tooling (D)

    (2) Case drain hose

    (3) Connector

    (4) Travel motor

  1. Install the following tools in accordance with the flow meter tool layout. Refer to Illustration 4.
  1. Disconnect case drain hose (2) from connector (3) .
  1. 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) .

  1. Remove 311-1362 Vacuum Cap and install the filler plug for the hydraulic tank.

Test Procedure

  1. Start the engine.
  1. Place the machine controls at the following settings: engine speed dial “10” and AEC switch OFF. Refer to Testing and Adjusting, “Engine Performance – Test (Engine Speed)” for engine rpm settings.
  1. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
  1. Move the left travel lever to full FORWARD position and check the flow of oil through the flow meter.
  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 4 through 7 in order to obtain three measurements of case drain oil.

The maximum acceptable flow of case drain oil when the travel crossover relief valves are set at 36800 ± 1500 kPa (5340 ± 220 psi). … 38 L/min (10.1 US gpm)