103
Maintenance
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
Monthly maintenance
Check the unit mounting hardware
Check for bolt tightness, cracks, and other abnormali-
ties on the subframe, hydraulic tank, pumpkit, dieren-
tial cylinders, and material cylinders.
Clean the hydraulic oil cooler ns.
Spray out the coils of the oil cooler with a high- velocity
water nozzle or pressure washer (Figure 14). If you use
a pressure washer, be careful not to get so close that
you damage the electric motor or bend the cooler ns.
Figure 14
Pressure washing oil cooler
Never point or aim the gun/wand at yourself or
anyone else. Never put your hand, ngers or
body directly in front of the spray nozzle.
Do not spray directly at electronics or electrical
components.
Quarterly maintenance
Check the pre- charge of accumulators
Check the accumulator gas pre-charge as shown:
• 1st check- one week after rst use
• 2nd check-one month after rst use
• 3rd check- quarterly
If the accumulator requires charging, read all of the in-
structions before beginning the job. Accumulators must
be charged only with dry nitrogen. Never use com-
pressed air or oxygen, as the oxygen molecules will
combine with the hydraulic oil and lower the ash point
of the oil to below room temperature. You will create
a major explosion by using compressed air or oxygen
to charge accumulators. People have died using com-
pressed air or oxygen to charge accumulators. Use dry
nitrogen, not liquid nitrogen. To charge the accumulator
see “Accumulator Charging Procedure” on page 110
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