307.5, 308, 308.5, 309, and 310 Mini Hydraulic Excavator Machine System Caterpillar

Swing Speed and Overswing on Level Ground - Check

Usage:

308 GG8

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Table 1
"Swing Speed and Overswing on Level Ground - Check"
Sales model	Item	Specification
307.5 308.5, and 308 308 CR, and 308 SR 309 310	Overswing⁽¹⁾ mm (inch)
	Right Swing	600 mm (23.62 inch) or less
	Left Swing	600 mm (23.62 inch) or less
	Swing Acceleration on Level Ground⁽²⁾ (sec/90deg)
	Right Swing	3.0 or less
	Left Swing	3.0 or less
	Swing Speed (Three Revolutions)⁽³⁾ (sec/3 rev)
307.5	Right Swing	17.1 - 19.8 or less
307.5	Left Swing	17.1 - 19.8 or less
308.5, and 308	Right Swing	16.2 - 17.3 or less
308.5, and 308	Left Swing	16.2 - 17.3 or less
308 CR, and 308 SR	Right Swing	15.9 - 17.8 or less
308 CR, and 308 SR	Left Swing	15.9 - 17.8 or less
309	Right Swing	16.6 - 17.6 or less
309	Left Swing	16.6 - 17.6 or less
310	Right Swing	15.6 - 18.5 or less
310	Left Swing	15.6 - 18.5 or less

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⁽¹⁾	Loaded bucket
⁽²⁾	Specification for 90 degree swing
⁽³⁾	Start the measurement after the upper structure has rotated one full revolution

Note: The engine speed and/or the machine configuration that is used during this test can affect the results of this test.

Reference: Testing and Adjusting, "Engine Performance - Test (Engine Speed)" for the engine speed that were used for this test.

Reference: Testing and Adjusting, "Operational Checks" for the machine configurations that were used for this test.

The relief valve pressure settings must be set to the relief valve pressure specification before performing this operational check.

Reference: Testing and Adjusting, "Specifications".

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

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Ensure that travel test ground must be hard and as level as possible.
Ensure that front implements, bucket cylinders, and swing control are at there maximum reach position.
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Illustration 1 g06364950
Position the machine on level ground. Refer to Illustration 1.
Stop the engine.
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Illustration 2 g06194809

(A) Upper frame
(B) Undercarriage frame
(C) Marking
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.

Start the engine.
Place the engine speed dial in the HIGH IDLE position.
Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
Load the bucket.
Weight of bucket load ... 170 kg (375 lb)
Move the swing joystick in either direction until the machine completes a 90 degree swing operation away from the target.
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.
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.

Start the engine.
Place the engine speed dial in the HIGH IDLE position.
Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
Empty the bucket and reposition the machine according to Illustration 1.
Move the swing joystick in each direction and measure the time that is required to complete a 90 degree swing operation. Refer to Table 1 for specification.

Start the engine.
Place the engine speed dial in the HIGH IDLE position.
Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).
Empty the bucket and reposition the machine according to Illustration 1.
Move the swing joystick in each direction and measure the time that is required to complete three revolutions. Refer to Table 1 for specification.