Trouble shooting HD 1050
14
3. Internal water leakage
Measuring the pump delivery, indicates a loss of
some water.
Possible cause: The suction valves, pressure
valves or relief valve are defective or incorrectly
mounted.
3.1 Checking the suction valves
Remove the housing cover.
Pull out the valves using the puller (special tool).
Check the sealing surfaces of the valve seat
und valve plate for dirt or grooves and replace
them if necessary.
Check the O-rings of the housing cover and
replace them if necessary.
Note: The support rings and O-rings should first
be coated with silicon grease before mounting.
Fit the housing cover and tighten the screws
with a torque of 22 Nm.
3.2 Checking the pressure valves
Unscrew the valve screws.
Pull out the valves using the pliers (special tool).
If the valve seat cannot be pulled out with pliers,
use the puller tool (special tool).
Check the O-rings, support rings, valve plates
and valve seats for wear and replace them if
necessary.
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