General Pump MSS Owner Manual - Manual (Page 14)

GENERAL PUMP
A member of the Interpump Group
MSS SERIES
With the tool in place, rotate the crankshaft until the
packing support is pushed out together with plungers and
cylinders (Fig. 21 and Fig. 22).
Repeat the operation for each pumping unit.
Remove the wipers from the plunger guides (1, Fig. 23).
In order to fit the new scraper in place shape it manually
as shown in Fig. 25. VERY IMPORTANT! The scraper is
provided with an internal lip which performs the correct
scraping effect only if oriented towards the fluid end. See
window inside Fig. 25. Put the pumping unit components
together and fit them back in the pump crankcase. Tighten
the plunger screws (1, Fig. 18) with a torque
wrench set for 72.3 ft. lbs. Grease the pressure packings
through the greasers (2, Fig 23) by means of a hand
pump. Stop greasing when the pump trigger becomes
hard to operate: that means the grease chamber is full.
Put head back in place , with head screws tightened at
180.8 ft. lbs.
Separate the pumping unit components and check them
for wear. Pressure packing replacement is carried out
by hand without need for special tools (Fig. 24). A little
bit of grease helps slide the packings into the packing
support. Pressure Packings and o-rings should always be
replaced at every disassembling of the pumping unit.
Page 14
Ref 300522 Rev.D
01-13