MYERS E110-14, Инструкции по безопасности, Страница: 7 / 20

26850A003
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REPLACEMENT OF VALVES
A. Inspect tapered valve seat bore in fluid end for rust
and wipe out excess with a rag. Place a new lower
seat in tapered hole. With a hardwood round dowel,
drive lower seat firmly into place with a hammer.
Repeat for upper seat being sure to also inspect the
tapered bore in housing for rust.
IMPORTANT: Both the valve seat O.D. and tapered
bore I.D. MUST BE VERY CLEAN.
B. Reassemble valve, spring, and cage as shown in
Fig. 6, Be sure that springs are in correct location.
When upper and lower valve seats are the same
size, the heavier spring (larger diameter wire) is
always installed on upper or discharge valve.
NOTE : Be sure that cage is tightened onto valve seat.
C. Inspect seals on valve and cylinder caps. Replace if
seals show signs of wear, or “nibbling.” Lubricate
seals and replace cap, bar and nuts. Torque cap
covers nuts to specification shown in torque chart.
CAUTION : Do not use a hand or arbor press to install
valve seats. It is possible to crack cylinder body with
excessive pressure.
REPLACING PISTON ROD SEALS
Fig. 8
The rod seal assembly contains two seals, two oil seals
with lips facing power end. The oil seal can be replaced
without taking the fluid end off by removing the cylinder
and piston to allow access for oil seal housing. Unscrew
two Allen screws and place into the other two tapped
holes. Gradually screw them in to push oil seal housing
off the retainer. After assembling new seals in oil seal
housing an assembly thimble should be used on end of
crosshead rod for sliding oil seal housing back into
retainer. Check gasket, replace if damaged.
An assembly thimble should be used on small end of
the piston rod to expand sealing edge as it is pushed on.
“Figure 9” illustrates an assembly thimble being placed on
the end of the rod. “Figure 10” shows a recommended
thimble for installation of oil seals. The thimble should be
machined from high carbon steel and polished on the
exterior to reduce possibility of seal lip damage.
REMOVING CRANKSHAFT AND PINION
SHAFT
Remove piston assemblies. Remove connecting link
caps and move the link-crosshead assembly as far
forward as possible.
IMPORTANT: Note the markings on the connecting links
and caps; these parts are not interchangeable and must
be reassembled in their original positions.
Wedge a ¾” board between crankshaft gear and gear
case so that crankshaft will be held in place against
pinion shaft. Remove both crankshaft bearing caps.
(See Fig. 11). Hold crankshaft at ring gear and left-hand
link journal (to prevent dropping into bearing bores),
remove from gear case by moving crankshaft to right until
left end can be swung free.
To remove pinion shaft, remove bearing cap bolts.
Next, using a lead or rawhide hammer, tap the end of
42 Oil Seal
41 Retainer
Fig. 10
37 Housing
Fig. 9
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