312F and 313F Excavator Machine Systems Swing Speed and Overswing on Level Ground

Table 1
"Swing Speed and Overswing on Level Ground - Check"
Swing Speed (three Revolutions (seconds)
Item	New	Service Limit	Actual
Right Swing	16.5 ± 1.5	21.5 or less
Left Swing	16.5 ± 1.5	21.5 or less
Overswing mm (inch)
Item	New	Service Limit	Actual
Right Swing	957 mm (37.7 inch) or less	1365 mm (53.7 inch) or less
Left Swing	957 mm (37.7 inch) or less	1365 mm (53.7 inch) or less
Swing Time⁽¹⁾ (seconds)
Item	New	Service Limit	Actual
Right Swing	4.0 or less	5.2 or less
Left Swing	4.0 or less	5.2 or less

Show/hide table

⁽¹⁾	The time that is required to complete a 180 degree swing operation

Measuring the swing speed and the overswing of the machine will determine if there is a need to check the swing motor or the anti-reaction valve. The fine swing control switch (if equipped) must be in the OFF position.

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

Show/hide table

Table 2
Required Tools
Description	Qty
Measuring Tape	1
Stopwatch	1

Test Procedure

Swing Speed (three revolutions)

Show/hide table




Illustration 1	g00297618

Position the machine on level ground. Refer to Illustration 1.
Note: The bucket should be empty.
Swing the machine in either direction. Use a stopwatch to count the swing time for three revolutions.
Note: Begin counting swing time after one full revolution has been completed.

Swing Acceleration and Overswing

Show/hide table




Illustration 2	g00297618

Position the machine on level ground. Refer to Illustration 1.
Note: The bucket should be empty.
Stop the engine.
Show/hide table

Illustration 3 g00293972

(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 3.
Start the engine.
Move the swing joystick in either direction until the machine completes a 180 degree swing operation away from the target.
Move the swing joystick in either direction until the machine completes a 180 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 3.
Note: Use a point that is visible from the operator seat as a reference point for the target.