Komatsu WA250PT-5H, Operation & Maintenance Manual

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OPERATION
Operation
Operations and checks after starting engine
3-71
To warm up the hydraulic oil in cold areas, do as follows.
2. During the warming-up operation, check that the engine
rotation is smooth, then set the safety lock lever (2) to the
FREE position.
3. Operate work equipment control lever (3) to TILT position
(e) and return it to HOLD position (b) to warm up the
hydraulic oil.
The relief time at the tilt position (e) should be a maximum
of 10 seconds.
With this operation, the oil will reach the relief pressure and
this will warm up the hydraulic oil more quickly.
4. After carrying out the warming-up operation, check that the
gauges and pilot lamps are normal.
If there is any abnormality, carry out maintenance or repair.
Run the engine under a light load until engine cooling water
temperature gauge (4) and HST oil temperature gauge (5)
are in the white range.
5. Check that there is no abnormal exhaust gas color, noise or
vibration. If any abnormality is found, contact your Komatsu
distributor.
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