Page 337 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

EXERCISE 18.5: Overhauling of Reciprocating Pump

Objectives

At the end of this exercise you shall be able to
• Service a reciprocating pump.

Requirements
Tools/Equipments Materials

• Trainees tool kit • Kerosene - as reqd.
• Torque wrench • beal - as reqd.
• Mallet • Grease - as reqd.
• Feeler gauge • Oil - as reqd.
• Puller • Cloth waste - as reqd.
• Gasket material - as reqd.
Equipments/Machinery
• Gear box coupled reciprocating pump

Procedure

Service a reciprocating pump

A Fluid end service
Fluid end removal
1 Disconnect suction and discharge lines, plunger oiler lines, and also any accessories such as stoke counters,
pressure gauges, etc. from the fluid end.
2 Open the hinged cradle cover on the top of the crosshead housing, if equipped and disconnect the plungers
from the extension rods by removing the extension rod clamps.
3 Slide the plungers into the fluid end as far as possible

4 Connect a hoist to the fluid end and tighten the lines 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 head capscrews from the fluid end using a hydraulic torque wrench with a point socket or a hand
tool combination of a torque multiplier, a drive torque wrench, a drive extension, and point socket.

6 Pull the fluid end assembly horizontally forward, straight away from the power end until it is completely clear
of the dowel pins.
7 Move the fluid end to the service area for changing valves or other service.

Fluid End Installation
1 Clean the surfaces between the mating faces of the power end counter bores, stuffing boxes, and fluid end,
removing any debris or surface imperfections such as corrosion or raised metal. Make sure the o-rings and
gaskets are in place.
2 Orient the stuffing boxes so that the dowel pin holes are on top
3 Lift the fluid end until the dowel pins match the dowel pin holes in the stuffing boxes and push the fluid end
toward the stuffing boxes.
4 As per fig 1, label the top row of bolt holes on the frame starting from the left corner to the right corner.

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