Bison 130 Instruction Manual page 13

Following operations and maintenance will extend the service life of the pump:
1.After using 20 hours of the new machine, pour out the machine oil,
and add the appropriate amount of kerosene.
Operate the pump without load in 10-15 seconds,
then close the machine and pour out the kerosene, finally add the new oil.
2.Accumulative use after 100 hours,
change the oil in the same way like above.
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