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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 three major modules:
the fluid end, the power end, and the gear
reduction unit. (See Section 2) 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 and Installation
1.
Disconnect suction manifold from unit
piping and discharge lines at the
discharge flanges on the fluid end,
plunger lubrication lines, and also any
accessories such as stroke counters,
pressure gages, etc. from the fluid end
2.
Open the hinged stainless steel cover
on the top of the crosshead housing
and disconnect the plungers from the
extension rods by removing plunger
clamps.
3.
Move the plungers inside the fluid
cylinder as far as possible.
4.
Connect hoist to the fluid end and
tighten the slings until they are snug
only. Make sure that hoisting slings are
not too tight, because that may
bend
the long tie rods and damage threads
in the pump frame.
5.
Remove all eight (8) 2-1/4" tie rod nuts
from the fluid end using the HYTORC
Model T-240K hydraulic tensioning tool
and air pump. Setting the pressure on
the air pump at 5,000 psi will be more
than adequate to remove nuts.
6.
Pull the fluid end assembly in
horizontal direction, straight away from
the power end until it is completely off
the tie rods.
7.
Move the fluid end to the service area
for changing valves or other service.
