320E RR Excavator Hydraulic System Caterpillar


Swing Motor - Test - Measurement of Case Drain Oil

Usage:

320E RR LHN

Specification

Table 1
"Swing Motor - Test (Measurement of Case Drain Oil)"    
Date     Machine Serial Number    
Machine Settings     Swing Relief Pressure     Engine Speed    
25500 ± 1500 kPa (3699 ± 218 psi) Engine 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 1g01623868

Tooling group "B"

198-4240 Digital Pressure Indicator Gp




Illustration 2g02156033

Tooling group (D)

Table 2
Required Tools    
Tool     Item     Part
Number    
Description     Qty    
B     198-4240     Digital Pressure Indicator Gp        
    B1     198-4234     Indicator     1    
B2 198-4239     Pressure Sensor

41,368 kPa (6,000 psi)    
1    
B3 198-4236     Extension Cable     1    
D     D1     6V-7788     Flow Meter

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

Machine Preparation

  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 3g02352913

    Flow Meter Tool Layout

    Tooling D

    (1) Case drain hose

    (2) Adapter

    (3) Swing motor

    (4) Swivel

  1. Install the following tools in accordance with the flow meter tool layout. Refer to Illustration 3.

  1. Disconnect case drain hose (1) from adapter (2) .

  1. Connect the flow meter assembly (D) between adapter (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 4g02072074

    Pilot Manifold (located behind the main control valve)

    (5) Solenoid valve for swing parking brake

    (6) Connector

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

Test Procedure

  1. Start the engine.

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

  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. Slowly move the swing joystick and make sure that the swing brake is activated.

  1. Move the swing joystick fully for 1 minute. Measure the case drain oil. Refer to Table 1.

  1. Stop the engine.

  1. Connect connector (6) to the solenoid valve for the swing parking brake (5) .

  1. Repeat this test procedure three times in order to obtain three measurements of case drain oil. For each test procedure, swing the upper structure to a different position.

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