330D, 336D and 340D Excavators Hydraulic System – Swing 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
“Swing Motor – Test (Measurement of Case Drain Oil)”    
Machine Settings     Swing Relief Pressure     Engine Speed    
31400 + 1000 – 1500 kPa (4554 + 145 – 218 psi) Speed Dial “10”
AEC Switch OFF    
Item     Specification (1)     Actual    
New Swing Motor     30 L/min (7.9 US gpm)     1.    
2.
3.
Rebuilt Swing Motor     35 L/min (9.2 US gpm)     1.    
2.
3.
( 1 ) Maximum acceptable flow

Introduction

Use the following procedure in order to measure the case drain of the swing motor.
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 g02155580

Tooling Group “D”
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 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-8943     Reducer    
D8 1     7J-9108     O-Ring Seal    
D9 1     6V-8398     O-Ring Seal    
D10 1     6V-8939     O-Ring Reducer    
D11 1     6V-8555     Nut    
F     1     311-1362     Vacuum Cap    

Machine Preparation

  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 2 g02155562

    Flow Meter Tool Layout

    Tooling D

    (1) Case drain hose

    (2) Elbow

    (3) Swing motor

    (4) Swivel

  1. Install the following tools in accordance with the flow meter tool layout. Refer to Illustration 2.
  1. Disconnect case drain hose (1) from elbow (2) .
  1. Connect the flow meter assembly (D) between elbow (2) and case drain hose (1) .

    Note: Correct orientation of the flow meter is necessary. The oil flows from swing motor (3) to swivel (4) .

  1. Remove 311-1362 Vacuum Cap .

    Illustration 3 g03405937

    Pilot manifold

    (5) Solenoid valve for swing parking brake

    (6) Connector

  1. Disconnect connector (6) from solenoid valve (5) for the swing parking brake.

Test Procedure

  1. Start the engine.
  1. Place the machine controls at the following settings: engine speed dial “10” and AEC switch OFF.

    ReferenceRefer to Testing and Adjusting, “Engine Performance – Test (Engine Speed)” for engine rpm settings.

  1. Place the hydraulic activation control lever in the UNLOCKED position.
  1. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
  1. Slowly move the swing joystick and make sure that the swing parking brake is activated.
  1. Move the swing joystick for a full SWING RIGHT. Measure the case drain oil. Refer to Table 1.
  1. Return the joystick to the NEUTRAL position.
  1. Stop the engine.
  1. Connect connector (6) to the solenoid valve (5) for the swing parking brake.
  1. Repeat this test procedure three times in order to obtain three measurements. For each test procedure, swing the upper structure to a different position.
  1. Connect connector (6) to the solenoid valve for the swing parking brake (5) .