General Pump MH - Manual (Page 12)

GENERAL PUMP
A member of the Interpump Group
MH SERIES
Page 12
11.3 Pumping unit maintenance
The only maintenance operation required for the pumping
unit is the pressure packings greasing through the proper
greasers (1, Fig. 16).
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 OCILIS 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. 7, page 9). It clearly shows the pressure packing
state of wear; replace them if water dripping becomes
continuous and not intermittent.
For inspecting the pumping unit remove the head by
loosening the eight head screws (1, Fig 17).
Loosen and remove the plunger screws (1, Fig. 18).
Remove the upper cover by loosening the four screws
(1, Fig. 19).
Push the plungers forward by rotating the crankshaft,
then introduce our tool pn/ F200030060 (or equivalent)
in between the piston guide and the packing support
(1, Fig. 20).