MSI QI-1000, Техническое руководство, Страница: 37 / 56

5.30 Removing the Crankshaft, Connecting Rods, and Crossheads
a) Remove the Gear Reducer assembly (see Section 7.10 .)
b) Remove the plunger and seal retainers (see Section 6.30 .)
c) Using a 9/16” wrench, remove the 3/8” cap screws, which secure the side and rear covers to the
Power Frame housing.
d) Remove the 1/8” cotter pin from the each of the connecting rod bolts. Using a 15/16” wrench,
remove the slotted 5/8” hex nuts from each of the connecting rod bolts. Remove the connecting
rod caps taking care to avoid damaging the rod bearing half trapped inside each cap. Shove
each connecting rod/crosshead assembly all the way forward taking care to avoid damaging the
rod bearing half trapped inside each connecting rod.
e) Using a ¾” wrench, remove the ½” cap screws which secure the wrist pin retainer plate to the
crosshead. Using a slide hammer with 1- ¼” UNC puller thread, pull the wrist pin from the
crosshead. Remove the connecting rod from the crosshead, and take it out of the Power Frame.
Rotate the crosshead 90 degrees and remove it through the side of the Power Frame. The
remaining crossheads should be removed in the same manner.
f) Reattach each match-marked connecting rod cap to the rod from which it was removed. Note:
If the connecting rod bearing halves are to be removed and re-used, they must be tagged so that
they can be reinstalled in the same connecting rod or cap.
g) Using a 9/16” wrench, remove the 3/8” cap screws, which secure the tach drive housing to the
Power Frame. Remove the tach drive assembly. **If required.
h) Using a 1 7/16” wrench, remove the eight 7/8” nuts, which secure the main bearing housing to
the Power Frame. Remove the main bearing housing and inspect the bearing for wear.
i) Turn the Power Frame housing over on its side so that the crankshaft extension is pointed
straight up. The Power Frame must be blocked up so that is rests level. Using a 9/16” wrench,
remove the 3/8” cap screws, which secure the three bearing retainers against the top inner main
bearing’s outer race. Lift the crankshaft from the Power Frame.
j) Using a 9/16” wrench, disconnect all six lube oil hoses from the fittings at the rear of each
crosshead guide. Using a 15/16” wrench, remove the two 5/8” cap screws, which secure each
see section crosshead guide to the Power Frame housing. Remove all six crosshead guides and
inspect them for wear.
k) Reassembly of the Power Frame should be performed in the reverse order of the disassembly
instructions shown above.
Note: Prior to reassembling the Power Frame, all lubrication hoses and lube passages should be
flushed and cleaned thoroughly.
When reinstalling the crosshead slides, care must be taken to avoid excessive torque on the 5/8”
cap screws to more than 50 ft-lbs. torque. Excessive torque can distort the surface of the slide
causing crosshead misalignment.
All cap screws, nuts, etc. must have the proper amount of torque upon reassembly (see Torque
Table in Appendix).