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6.0 Maintenance
• Post safety warnings and barricade work
area to prevent unauthorized use of the
dynamometer before maintenance has been
completed.
•
Only qualified machine operators and
maintenance personnel should perform the
procedures covered in this manual.
!
WARNING
6.2 SF-902S Maintenance
The absorber requires very little maintenance. Follow the suggestions below to increase the life and
reliability of your absorber.
Water Filters
Contaminated water can reduce the life of an absorber and increase maintenance cost. Clean the filter on
the input to the absorber after every 50 hours of operation and change when needed. Signs of a clogged
filter is if the absorber cannot hold a load at the upper end of an acceleration test. A replacement filter can
be ordered through SuperFlow Customer Service, part number 4500P-5060.
Change and clean filters on the water supply line to the dyno according to the manufacturer’s
recommendations. An indication of a defective supply filter is when the water supply cannot maintain a full
sump tank.
Automatic Water Fill Valve
The black plastic valve on the main inlet to the water tank controls the water flow to the dynamometer tank.
The tank level is set with the float valve inside the tank. The tank can possibly overflow the first time it is
filled but should not happen again after the automatic valve is primed. The control valve rarely fails to work
properly, but if it does, it is because debris is trapped under the diaphragm in this valve or the float valve
does not shut off properly.
The handle controls how fast water bleeds from one side of the diaphragm to the other and therefore
controls how fast the valve turns on and off. This is usually left wide open for the fastest response and
should not require adjustment, but it can be adjusted if necessary.
If the water does not shut off completely or almost completely (just a couple drops per second at worst),
check the float and the diaphragm before ordering a replacement valve because it is unlikely the entire
valve is faulty. Usually the float valve is not shutting off completely because of debris in the orifice or the
float is not set properly.
1.
Check the float valve in the tank to make sure it is being pushed up far enough to close. If necessary,
bend the rod on the float until the valve shuts off.
2.
If the valve still does not shut off, remove the eight bolts that secure the top of the black valve, and
remove the cover and the diaphragm from inside.
AUTOMATIC STARTING HAZARD.
An engine connected to
dynamometer could be started
remotely. Ensure starting has been
disabled prior to servicing.
!
WARNING
