26850A002 06/04/14
5
REPLACING PINION SHAFT AND SHIMMING
BEARINGS ON HYDRAULIC DRIVEN PUMPS
Press bearing cones onto both ends of the pinion shaft,
being sure bearing seats completely against stop on
shaft. Place pinion and bearing cone assembly into
the crankcase, positioning the pinion gear over the
crankshaft gear. Carefully press bearing cups into both
sides of the crankcase. Tap cups until bearing cups
and cones are completely together and pinion is in the
proper location in the crankcase. Press shaft seal into
cap, bearing and seal plate. Be sure both caps are
installed with the lip towards the center of the pump.
Install right bearing cap with two .003" thick shims and
tighten. Install left bearing cap with one .015" thick shim,
and one .003" thick shim and tighten. Rotate pinion
shaft back and forth, applying about 15 lbs. axial force
to properly seat the tapered rollers. Measure end-play
by using an indicating gauge. Subtract recommended
end-play (.005"–.009") from actual end-play. This is the
amount of shim that must be removed. After excess
shim thickness has been removed, replace left cap
and retighten cap screws. Measure end-play again and
repeat if necessary.
REPLACING CRANKSHAFT AND
SHIMMING BEARINGS
Press the bearing cups into the caps. Place one cap
into position on the right side with cap screws engaged
about one turn. Install crankshaft (left end first), and push
both bearing caps into place. Extreme care should be
exercised to avoid damage to gear teeth, bearings, and
link journals.
For quiet operation and long life, the crankshaft and
bearings must be installed with .003" to .005" preload.
To adjust, loosen the four cap screws on the pinion shaft
bearing cap.
Place about a .045" shim on the right crankshaft bearing
cap, and tighten the five cap screws. Install the left cap
without shims and secure with two cap screws. Torque
at 13 ft/lbs and rotate the crankshaft. Retorque the cap
screws. Repeat three times to properly seat the tapered
roller bearings. Measure (adjacent to the cap screws) the
shim gap remaining between the bearing cap and the
gear case. The required shim thickness for this cap is
equal to the average gap measurement plus .022". Insert
correct shim thickness under left bearing cap and tighten
cap screws. Install connecting links and caps, then
torque cap screws to 40 ft/lbs.
IMPORTANT – Check for adequate side clearance of
links on crankshaft. Some shims must be moved from
one end to the other until sideways movement of all links
can be seen.
Check torque of cap screws on all bearing caps.
RECONDITIONED CRANKSHAFTS
When the crank throws are slightly damaged, they can
sometimes be reconditioned for further use. This can
be done by sandpapering and polishing until all ridges
are completely removed. The final polishing operation
should be with very fine emery cloth. If the surface is
badly damaged, the crankshaft can often be salvaged by
“metalizing” the crank throw, regrinding and polishing to
the original diameter.
SERVICING CONNECTING LINKS
The connecting rod link is furnished with replaceable
split sleeve bearing inserts at the crank throw. Do not
attempt to re-fit connecting links to the crankshaft
bearings by filing or grinding the matting faces of the link
cap where it contacts the link. Always be sure that the
proper side of the link is placed upward when attaching
it to the crankshaft. The upper side contains an oil hole
at the crosshead end of the link. This oil hole must be up
to allow proper oil feeding to the crosshead pin bushing.
The wrist pin is press-fitted into the crosshead and
slip-fitted through the bronze bushing. Use arbor press
to force in the wrist pin, checking to see if the link is
free to rotate after the wrist pin is pressed in. Verify that
both sides of the wrist pin do not protrude beyond the
crosshead.
The crosshead end of the connecting link is fitted with
a bronze bushing. New replacement link bushings are
reamed to the proper size for immediate installation.
If only the bushing is replaced, it may be necessary to
ream the new bushing to the proper inside diameter after
it is pressed into the link. When placing the bushing on
the link, be sure that the oil holes in the bushing and link
are in line after the bushing is pressed into position.
CROSSHEAD AND PISTON RODS
Repair parts for the crosshead and piston rod are
supplied as a complete unit. If either of these parts
becomes worn it is necessary to replace both the
crosshead and piston rod. Under normal conditions
a crosshead will not wear, nor will the bore of the
crankcase wear to the extent that oversize crossheads
will be required. A clearance of .002" to .004" is standard
for the crosshead.
RECOMMENDED TORQUE (foot-pounds)
FASTENER LOCATION
Link Bearing Caps - 40
Crankshaft End Caps - 20
Pinion Bearing End Caps - 20
Cap Screw, Piston
Assembly to Piston Rod - 50
Valve Cap Clamps - 100
Cylinder Cap Clamps - 175
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