Measuring Swivel Performance; Measuring Swivel Motor Drain Volume - Kubota KX080-4 Workshop Manual

KX080-4, WSM

[6] MEASURING SWIVEL PERFORMANCE

(1) Measuring Swivel Motor Drain Volume

Purpose
• Measuring the drain volume when operating allows an assessment of swivel motor performance.
IMPORTANT
• Swivel motor performance is used along with swivel block performance and measurement of swivel
speed to make a comprehensive assessment.
• When using this procedure to make measurements, the movement is in one direction.
[Measurement preparations]
1. Place the mini excavator on flat hard ground, lower the bucket and the blade, and stop the engine.
2. Follow the chapter Releasing Pressure in the Hydraulic System and release pressure in the hydraulic lines.
3. Attach a vacuum pump.
4. Disconnect the hose that connects the oil cooler and the return filter on the return filter side and plug the
disconnected hose and adapter.
5. Disconnect the return hose that connects the control valve and the swivel motor on the swivel motor side and plug
the disconnected hose and adapter.
6. Disconnect one of the high-pressure hoses that connects the control valve and the swivel motor on the control
valve side and split the unload valve and port T so it returns directly to the tank. Plug the hose with the
disconnected adapter.
7. Disconnect the swivel motor's drain hose from the swivel motor side, and plug the disconnected hose.
8. Swap out the swivel motor drain hose with a test hose.
9. Remove the vacuum pump.
10. Operate the swivel and allow the swivel motor to warm up fully. However, operate the swivel slowly as cavitation
may occur.
• Hydraulic oil temperature of 50 ± 5 °C (122 ± 9 °F).
CAUTION
• Before commencing measurement, make sure there are no persons or obstacles within the swivel range.
• To measure the opposite direction, swap the swivel motor's high pressure hose.
3-S148
HYDRAULIC SYSTEM
(1) Plug
(2) Graduated Cylinder
(3) Test Hose
(4) Adapter
RY9212148HYS0341US0
RY9212148HYS0342US0
KiSC issued 08, 2015 A