General Pump HF Owner Manual - Manual (Page 12)

GENERAL PUMP
A member of the Interpump Group
HF SERIES
Page 12
11.1.1 Crank mechanism disassembling
Do as follows:
A) Drain the oil from the pump and remove:
- shaft key
-back cover
-connecting rod cap
- side covers. To do so, use 3 screws (M6 x 50)
wholly threaded, putting them into the holes
drilled for that purpose. See Fig. 9.
C) Disassemble the crankshaft oil seals and the piston
guides using standard tools.
A) Fit the piston guide seals into their seat thoroughly
making sure they are correctly positioned.
B) Introduce the unit piston guide/connecting rod into
their seats. To facilitate the tightening of the
connecting rod cap, position the connecting rod
so you can easily read the number. To install the
crankshaft, without key, it is necessary to push
the unit piston guide/connecting rod backward.
11.1.2 Crank mechanism reassembling
After washing the crankcase, reassemble the power end
as follows:
B) Push the piston guides and connecting rods forward
so you can remove the pump crankshaft from the
side. On the crankshaft, you will find marks (see Fig.
10) that must be turned towards the operator so the
crankshaft can be easily extracted.
NOTE: to extract the piston guide, it is necessary to
remove the cramic plunger and wiper first.