Gardner Denver HD-2250, Operating And Service Manual

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SECTION 4
SERVICE PROCEDURES
This section describes various assembly
and disassembly procedures necessary for
pump servicing or parts replacement. The
General Requirements and Safety Rules
section is a reminder for the maintenance
personnel of the critical importance of safety
rules and precautions while working on the
pump. Notes on dangers and notices
specifically related to service procedures
are repeated and placed in this section also.
The pump consists of two major modules:
(1) the fluid end and (2) the combination
power end and gear reduction unit. (See
Section 3) The description of service
procedures follows the modular concept.
Due to many expendable parts, fluid end
servicing is rather common in the field and
is therefore presented in the very beginning
followed by power end and gear reduction
unit servicing procedures.
General Requirements and Safety Rules
DANGER
Before any attempt to work on pumps
is
made, all safety rules and
precautions described in this manual
must be read and clearly understood.
DANGER
Only qualified and specially trained
personnel should be allowed to work
on this pump.
DANGER
Proper capacity hoist and lifting
devices
should be used while
working on pump.
FLUID END SERVICE
This discussion starts with the description of
steps necessary for removal and installation
of the fluid cylinder assembly and proceeds
to the removal and replacement of
expendable parts such as valves, valve
seats, and packing.
Fluid End Removal
1.
Disconnect suction and discharge lines,
plunger oiler lines, and also any
accessories such as stroke counters,
pressure gages, etc. from the fluid
cylinder.
2.
Open the hinged cradle cover on the
top of the crosshead housing, if
equipped, and disconnect the plungers
from the pony rods by removing the
pony rod clamps.
3. Slide the plungers into the fluid
cylinder as far as possible.
4.
Connect a hoist to the fluid end and
tighten the lines until they are snug
only. Make sure that hoisting slings are
not too tight, because that may cause
a strain on the fluid end and cause
injury or damage when removing from
the pump frame.
5.
Remove the twelve (12) 1-3/4” tie rod
nuts from the fluid end flange using a
hydraulic tensioning tool or hammer
wrench. (A hydraulic or manual torque
wrench is recommended for proper re-
installation).
6.
Pull the fluid end assembly horizontally
forward, straight away from the power
end until it is completely clear of the tie
rods.
7.
Move the fluid end to the service area
for changing valves or other service.