Gardner Denver HD-2250, Operating And Service Manual

Page: 33 / 47

Page 26
FIGURE 4-5 Crosshead Assembly
11. Remove
the fasteners from the
crosshead thrust-bearing retainer.
Remove the retainer to access the
thrust bearing.
12. Examine the thrust bearing and the
mating surface of the connecting rod.
These must be free from nicks, burrs,
and wear before they can be reused.
Conn-Rod Bearing Housings
1.
To remove the conn-rod bearing
housing, remove the four (4) cap
screws retaining the bearing cap.
2.
Remove the cap, noting that two dowel
pins PILOT the halves together. Do
not damage dowel pins. CAUTION:
Both halves are heavy. Cap-half of
bearing has locator pins.
3.
Remove half-bearing with prying
action.
4.
Rod-half of bearing may be tapped on
one edge with a rubber hammer or
wooden handle to remove.
5.
Cap and Rod-half must stay together
as a unit for re-assembly. Re-
assembled unit must be free to move
on crankshaft.
Crosshead Guide and Stay Rods
1.
The crosshead guides or “slide” should
be replaced if excessively worn or
damaged. (See CLEARANCES pg. 33)
2.
If the crosshead guides must be
replaced, it is recommended that it be
done either by Gardner Denver or a
qualified machine shop.
3. The stay rods are threaded into the
power frame. They can be easily
replaced by unscrewing and re-torquing
new rods. (See Torque on pg. 34)
4.
Check all stay rods for proper torque,
plus check for broken or cracked
threads.
5.
The stay rods need to be torqued to the
values shown on page 34 when they
are installed in the power end.
Gear Reduction Unit
NOTICE
This assembly is a timed gear set,
and should be changed as a gear set.
Proper timing can be done through
the use of offset keys.
1.
Disconnect the input pinion shaft from
the transmission or drive shaft.
2.
Disconnect the gear cover lube hoses
and remove the roto-seals from the
crankshaft.
3.
Remove the input drive flange from the
pinion shaft.
4.
Remove the input pinion seal and
pinion-seal housing from the gear
cover.
5.
Remove the cap screws retaining the
gear covers and remove the covers.