Weir SPM QWS 2500 XL, Инструкция по эксплуатации и руководство по обслуживанию, Страница: 41 / 44

41 of 44
Document P/N: 2P137414
Release Date: 05/29/2017
Revision: IR
SPM
®
QWS 2500 XL Power End Repair Procedures:
Due to the complexity of the task and the need for special tools and training, Weir Oil and Gas does not
recommend the complete disassembly and major repair of the SPM
®
QWS 2500 XL power end in the field. If
extensive power end repairs are required, the pump should be returned to the Weir Oil & Gas plant where
expert service can be obtained on an expedited emergency basis if needed. When field repairs are necessary,
they should be performed in a clean well equipped shop by a trained well service pump technician, and should
follow the guidelines below. Disassembly or tampering beyond the procedures detailed below could result in the
voiding of warranty.
To Replace a Pony Rod or Pony Rod Seal:
1. Using a 3/8” hex key wrench, remove the two 1/2” socket head capscrews from the plunger clamp.
Separate the two halves of the plunger clamp and remove them from the pony rod. If more than
one clamp is removed, take care to keep the clamp halves in matched pairs. Inspect each clamp
for wear or damage to the inside surface.
2. Remove packing nut lock if applicable. Using the SPM
®
packing nut tool, loosen the packing nut
one full turn. Separate the plunger from the pony rod taking care to avoid damaging the mating
face of either. Slide the plunger all the way into the fluid end.
3. Using a 9/16” wrench, remove the eight 3/8” capscrews which secure the pony rod seal retainer to
the power end. Remove the pony rod seal retainer and it’s gasket from the power end. Using a
7/16” wrench, remove the three 1/4” capscrews and 1/4” washers which retain the pony rod seal.
Inspect the double lip pony rod oil seal for damaged, worn, or hardened non-pliable sealing lips
and replace the seal if necessary.
4. Cut the tie wire which is laced through the six 3/4” socket head capscrews that secure the pony
rod to the crosshead. Using a 5/8” hex key wrench, remove the six 3/4” socket head capscrews.
Remove the pony rod from the power end and inspect it for wear and damage to the seal surface
and clamp end.
5. Reassembly should be performed in the reverse order of the procedure above.
Care must be taken to avoid damaging the sealing lips of the pony rod oil seal upon reinstalling the
seal retainer. A new gasket should also be installed to prevent oil leaks.
Refer to the drawing packing in this manual for tightening all capscrews, etc. to proper torque
values.
To Replace a Stay Rod:
1.
Remove the fluid end as outlined previously in the “Fluid End Repair Procedures” section of this
manual.
2. Using a hydraulic torque wrench, remove the stay rod from the power end. Two piece stay rods
should not require a hydraulic torque wrench for removal. Inspect the stay rod for wear on the face
of the shoulders at each end and for cracks in the thread roots and near the shoulders at each
end.
3. Inspect the mating face of the power end housing for wear and fretting. Check the threads in the
power end face for wear and damage.
4. Reinstall the affected stay rods (and fluid end as outlined previously). Torque the stay rod as shown
below. Again for two piece stay rods, the inner rod should be bottomed out into the power end
noseplate with no additional applied torque.
a.) Stay rod torque at nose plate…….……1000 ft-lb. (for one piece only, Two piece
bottomed out)
b.) Nut torque at cylinder flange…………2000 ft-lb.