General Pump HE - Manual (Page 11)

GENERAL PUMP
A member of the Interpump Group
HE SERIES
Page 11
11.3 Pumping unit maintenance
The only maintenance operation required for the pumping
unit is greasing the pressure packings through the proper
greasers (1, Fig. 11) located on the packing supports.
Greasing should be carried out at even intervals at
least every 100 hours by means of a hand pump. Stop
greasing when the pump trigger becomes harder to
operate: that means the grease chamber is full. Use top
quality silicone grease (i.e DANKELL OCILUS 250,
penetration coefficient 290 or a corresponding one).
Periodically check the amount of water drained out by the
pump through the hole provided in the lower cover
(Fig. 6). It clearly shows the pressure packing state of
wear; replace them if water dripping becomes continuous
and not intermittent.
In order to replace the pressure packings, remove the
fluid end first. It is recommended to remove head and
collector from the pump in one piece in order to avoid
possible splitting hazards of the suction/delivery valves
positioned in between. In order to do so loosen and
remove only two of the head bolts (2, Fig. 11).
Replace them with two screws with nut (1, Fig. 12) to keep
head and collector packed together and then
remove the other six head bolts.
Now head and collector can be easily separated from
the pump.
Check the plungers for wear and replace if necessary by
loosening the plunger bolt (1, Fig. 15).
Fit the extractor in place and remove the cylinders
(1, Fig 14).
Once the fluid end is removed, cylinder and packing
supports are free to slide out. Removing the cylinders is
easier by using our extractor pn/ F20000020 or an
equivalent tool.