Maintenance
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(P305):pHseriesMAINTENANCE.fm
45
Operation Manual - SP 305
Preventative Maintenance
NOTE!
There is a sample maintenance chart shown
in this section of the manual, page 57.
Daily maintenance
1. Check the levels and condition of the lubricants
and coolant in the towing truck. Follow the
manufacturers recommendations for quantity
and type.
2. If the towing vehicle has air brakes, bleed the
moisture out of the truck air system by opening
the pet cocks located on the bottom of the air
tanks. This is especially important if there is a
chance that the moisture will freeze.
3. Check the condition of the tires on both the
towing truck and the trailer. Do not drive the unit
with bald, cracked or damaged tires.
4. Check the level and condition of the hydraulic oil
(Figure 31). Top up, if necessary, with the same
brand and type of oil. If you have a filter buggy
to pump oil into the tank, use it. Replace milky
looking oil, which is a sign of water
contamination. Try to determine the source of the
water, if possible. If the oil has turned milky
quickly, like from one day to the next, then just
replacing the oil will not solve your problem, and
the new oil may be milky looking the next
morning. If you need help with ideas of where to
look for the source of water contamination, call
Schwing America’s Service Department at (651)
429-0999.
5. Bleed the water out of the bottom of the
hydraulic oil reservoir by opening the drain cock
or faucet located at the bottom of the reservoir
(Figure 32). Place a drain pan under the outlet
hose, open the valve, and watch the liquid as it
leaves the hose. When the liquid changes from
water to oil, close the valve. Because of
condensation, which is aggravated by large
heating-cooling cycles, it is normal that there
will be a small amount of water in the tank every
day, but it should settle to the bottom of the tank
overnight. The water that is drained should be
clear, and the oil that follows it should also be
clean, not milky.
6. Check the differential cylinder rod packings for
wear by filling the waterbox with water above
the level of the differential cylinder rods (if no
grate is installed) or above the bolt down grates
(if installed). Let it sit for a few minutes. If oil
begins to float to the top of the water, it is an
indication that the rod packings are worn. (Oil is
lighter than water, and will float.) Don’t forget to
Figure 31
The hydraulic oil level indicator
Oil Level
Indicator
OilLEV.eps
tankdrain.eps
Drain cock
Figure 32
The drain cock used to drain water
from the reservoir
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