538 Forest Machine Machine Systems Swing Motor - Test - Measurement of Case Drain Oil Caterpillar


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

Specification

Table 1
"Swing Motor - Test (Measurement of Case Drain Oil)" 
Date  Machine Serial Number 
Machine Settings  Swing Relief Pressure  Engine Speed 
31000 ± 1000 kPa (4496 ± 145 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

Required Tools



Illustration 1g01623868
Tooling group "B"
198-4240 Digital Pressure Indicator Gp


Illustration 2g02709177
Tooling group (D)

Table 2
Required Tools 
Tool  Item  Part
Number 
Description  Qty 
198-4240  Digital Pressure Indicator Gp   
  B1  198-4234  Indicator 
B2 198-4239  Pressure Sensor
41,368 kPa (6,000 psi) 
B3 198-4236  Extension Cable 
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 122-6870  Bulk Hydraulic Hose  3 ft 
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 

Machine Preparation


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.


  1. Stop the engine.

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

  3. 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 3g02788993
    Swing Motor Compartment
    (1) Case drain hose
    (2) Adapter

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


    Illustration 4g02352913
    Flow Meter Tool Layout
    Tooling D
    (1) Case drain hose
    (2) Adapter
    (3) Swing motor
    (4) Swivel

  5. Connect the flow meter assembly (D) between adapter (2) and case drain hose (1). Refer to Illustration 4.

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



    Illustration 5g02072074
    Pilot manifold
    (5) Solenoid valve for swing parking brake
    (6) Connector

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

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

Test Procedure

  1. Start the engine.

  2. Place the engine speed dial at position "10" and AEC switch OFF.

    Reference: Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for engine rpm settings.

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

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

  5. Move the swing joystick fully for 1 minute. Measure the case drain oil.

  6. Stop the engine.

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

  8. Repeat this test procedure three times to obtain three measurements. For each test procedure, swing the upper structure to a different position.

The following values specify the maximum acceptable flow of case drain oil when the swing relief pressure is set at 31000 ± 1000 kPa (4496 ± 145 psi).

New swing motor ... 30 L/min (7.9 US gpm)
Rebuilt swing motor ... 35 L/min (9.2 US gpm)

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