303.5E2 CR, 304E2 CR, 304.5E2 XTC, 305E2 CR and 305.5E2 CR Mini Hydraulic Excavators Hydraulic System Swing Speed and Overswing on Level Ground - Check Caterpillar


Swing Speed and Overswing on Level Ground - Check
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1.1. Specification
2.1. Introduction
3.1. Required Tools
4.1. Test Procedure

Specification

Table 1
Overswing 
Item  Specification 
303.5E2/304E2 305E2/305.5E2 
Right Swing  180 mm (7.1 inch) or less  270 mm (10.6 inch) or less 
Left Swing 

Table 2
Swing Time(1) 
Item  Specification 
303.5E2 304E2  305E2/305.5E2 
Right Swing (90°)  2.5 sec or less  2.5 sec or less  2.5 sec or less 
Left Swing (90°) 
Continuous swing right (three revolutions)(2)  17.8 - 21.5 sec or less  17.0 - 19.8 sec or less  17.5 - 19.5 sec or less 
Continuous swing left (three revolutions)(2) 
(1) Empty bucket
(2) Start the measurement after the machine has rotated one full revolution.

Introduction

Measuring the swing speed and the overswing of the machine will determine if there is a need to check the swing motor.

Note: The engine speed and/or the machine configuration that is used during this test can affect the results of this test. Refer to Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for the engine speed that was used for this test. Refer to Testing and Adjusting, "Operational Checks" for the machine configurations that were used for this test.

Note: The relief valve pressure settings must be set to the relief valve pressure specification before performing this operational check. Refer to Testing and Adjusting, "Specifications".

Required Tools

Table 3
Required Tools 
Description  Qty 
Tape Measure 
Stopwatch 

Test Procedure



Illustration 1g02824597

  1. Position the machine on level ground. Refer to Illustration 1.

  2. Fully retract the stick cylinder and fully extend the bucket cylinder.

  3. Stop the engine.


    Illustration 2g00293972
    (A) Upper frame
    (B) Undercarriage frame
    (C) Marking

  4. To indicate the relationship of the two positions, put a mark (C) on the inner race and the outer race of the swing bearing. The mark will be used as a target to stop the swing operation. Refer to Illustration 2.

  5. Start the engine.

  6. Place the engine speed dial in the HIGH IDLE position.

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

  8. Load the bucket.

    Weight of bucket load (303.5E2/304E2) ... 150 kg (330.7 lb)

    Weight of bucket load (305E2/305.5E2) ... 210 kg (463.0 lb)

  9. Move the swing joystick in either direction until the machine completes a 90 degree swing operation away from the target.

  10. Move the swing joystick in the opposite direction until the machine completes a 90 degree swing operation toward the target. Return the swing joystick to the NEUTRAL position at the target.

  11. Measure the amount of overswing by measuring the distance between the marks on the swing bearing. Refer to Illustration 2.

    Note: Use a point that is visible from the operator seat as a reference point for the target.

  12. Empty the bucket and reposition the machine according to Illustration 1.

  13. Move the swing joystick in each direction and measure the time that is required to complete a 90 degree swing operation.

    Move the swing joystick in each direction and measure the time that is required to complete three revolutions.

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