Gardner Denver HD-2250, Operating And Service Manual

Page: 34 / 47

Page 25
6.
Cut the safety wire (if used) and
remove the four (4) screws.
7. Remove the set screws on the square
keys, pull keys with a puller.
8. Connect a sling and overhead hoist to
one gear. Pull gear off and lay on side
for safekeeping. Remove second gear.
9. Remove capscrews retaining pinion
bearing housings. Using jack-screw
holes, remove one bearing housing.
10. Pinion and other housing may now be
removed with the aid of a lift.
Crankshaft Assembly
1.
Remove the pump from the trailer and
move it to a service area. (The pump
service area must have overhead-lift
capability.) Power end must be level.
2.
Remove the fluid end as described in
"Fluid End Removal and Installation,"
page 20.
3.
Remove the oil stop head seal retainer
and gear covers as described in “Oil
Stop Head Seal Retainer and Gear
Covers,” page 23.
4.
Remove the crosshead assemblies as
described in “Crosshead Assembly,”
page 23.
5.
Remove the connecting rods as
described in “Crosshead Assembly.”
6.
Remove the bull gears as described in
“Gear Reduction Unit,” on page 24.
7.
For best results, a “special” crankshaft
handling tool should be fabricated to fit
one of the 7.000” dia. Crankshaft
bosses. This “L” shaped lifting tool
should come up and over the top of the
pump, out to the centerline for easy,
balanced lifting of the crankshaft.
This tool must be capable of lifting the
crankshaft in a horizontal position.
8.
The crankshaft is now free to move.
9.
Install the “special” crankshaft lifting
tool, and balance the crank with an
overhead lift.
10. Thread the crankshaft through the
bearing races until all of the bearings
are free.
11. Carefully place the crankshaft on a
clean piece of cardboard, clean
plywood, or clean rug. Cover the
crankshaft and bearings with plastic to
prevent contamination of the bearings.
12. If the bearings are to be replaced
remove the outer race from the frame
by removing the lock and retainer
rings.
13. If the crankshaft main-bearings are to
be replaced, all bearing retainers must
be removed from the crankshaft. The
crankshaft should be held in a vertical
position, and the bearings rapidly
heated and allowed to drop off to the
floor.
Crankshaft Replacement
1. Before installing the crankshaft, check
to be sure that all oil passages are
clear.
2. Install the main bearing inner race
assembly and retainer rings, starting
from the center mains outward.
3. The main bearing inner race assembly
is readily installed by utilizing a hot oil
bath.
4. Retainer rings must be brazed at their
ends in order to make secure in groove.
NOTICE
Avoid brazing the ring to the
crankshaft.