OP001014
Operation
3-10
7.
Rotate starter key to "O" (OFF) position. Remove key.
Hydraulic System Warm-up
1.
Correct operating temperature of hydraulic oil is 50° - 80°C
(120° - 175°F). Make sure to follow procedures listed
below for hydraulic fluid warm-up.
2.
Run engine at idle (no load) for five minutes.
3.
Run engine for approximately five minutes at middle of
speed range, without a load.
4.
Cycle bucket until bucket cylinder bottoms out (extended
and retracted) without a load to circulate the oil through the
system. Do this for five minutes.
NOTE:
Do not allow cylinders to pass hydraulic oil over
relief valve for more than twenty seconds at a
time.
5.
Cycle boom, and bucket about five times without a load to
circulate oil through system.
Hydraulic System Warm-up – Cold
Weather
1.
Follow Steps 1 through 3 in "Hydraulic System Warm-up."
2.
Do not operate machine at full speed until system has fully
warmed up.
3.
If working speeds continue to be slow, repeat initial
hydraulic warm-up procedures again. If repeating warm-up
procedures does not improve working speeds, continue to
operate, but use extreme caution because machine
function may be erratic.
FG003900
O
I
Figure 23
Summary of Contents for DL220
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