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SM20 User Manual ◄ 11
• Do not lift water mixed with solids over 40 ft/12 m if
hydraulic ow from the power source is less than 7
gpm/26 lpm.
• If output ow from the water hose drops during oper-
ation, clean out the hose to remove all obstructions.
Check for kinks in the hose.
NOTE:
Always keep water speed as fast as possible during
operation. This helps to pump solids through the
hose and keeps the pump clean for longer life.
COLD WEATHER OPERATION
If the sump pump is to be used during cold weather,
preheat the hydraulic uid at low power source speed.
When using the nor mally recommended uids, uid
should be at or above 50 °F/10 °C (400 ssu/82 centi-
stokes) before use.
Damage to the hydraulic system or pump motor seals
can result from use with uid that is too viscous or thick.
MAINTENANCE
CLEANING THE PUMPING CHAMBER
Debris such as weeds, sand and other solids may be-
come trapped in the water hose and pumping chamber.
This can reduce pump performance. It is important that
the pumping chamber be kept clean at all times. The
chamber can be cleaned as follows:
1. Remove motor and impeller by removing the seven
5/16–18 capscrews (item 14).
2. Thoroughly clean the volute and impeller. Do not
remove the impeller unless necessary for repair or
replacement or to remove trapped debris.
3. Remove all debris from the pump screen by remov-
ing the four 5/16–18 capscrews (item 18).
4. Assemble the motor and impeller to the volute.
Clean the capscrews and lubricate the threads with
underwater grease before installation.
5. Remove all debris from the hose. Otherwise, solids
will backll the pump.
OPERATION