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Periodic inspection
To ensure efficient and smooth operation of the pump, periodically inspect the pump and
installation. When inspecting, overhauling, or if repair is necessary, stop the pump operation and
contact the supplier as necessary.
The overhauling and repair work for Walchem pumps must be performed by qualified personnel
who have been trained and certified by the pump supplier. User’s failure to observe this instruction
exempts Walchem from the responsibility for personal injury or damage to the equipment or facility
that result from its misuse.
1. Valve Unit
Check the valve balls, valve seats and valve guides every 6 months. If flaws or worn parts are
found, replace them.
2. Diaphragm
Check the diaphragm every 6 months if the usage is fairly light. The life of the diaphragm
depends on the characteristics, pressure, temperature, etc. of the liquid being pumped. If any
deformation or crack is found, the diaphragm should be replaced with a new one.
3. Oil
Change the oil in the drive unit once a year. If emulsification of the oil is found during
inspection, immediately change the oil. Remove the drain plug and drain the drive unit. Flush
the inside with oil to clean it. Then, add new oil up to the specified level of the oil gauge.
Ensure any replacement oil is SAE (80W-90) and must exceed API Service GL-4.
Model
Oil Qty
Recommended Oil
LKN
7.44oz
(220 mL)
Esso (Exxon) GP80W-90, Shell Spirax/EP80,
Mobil Pegasus Gear Oil 80
(Automobile Gear Oil SAE-80, API Grade GL-4),
Castrol Hypoy Gear Oil
Contact your Walchem distributor if the oil listed above is unavailable. Use of incorrect oil may
shorten the life-term of the gear unit.
Drain plug
