Gardner Denver PZG – 7” Operating And Service Manual - page 25
15-600 Page 20
METRIC EQUIVALENTS
Inches
mm
Inches
mm
3/8 (.375)........................................................................
9.525
3.................................................................................
76.2
.38 ..................................................................................
9.652
3.20............................................................................
81.28
.68 .................................................................................. 17.272
4.0..............................................................................
101.6
.69 .................................................................................. 17.526
4.2..............................................................................
106.68
25/32 (.78125)................................................................ 19.844
4.44............................................................................ 112.776
7/8 (.875)........................................................................ 22.225
4.5..............................................................................
114.3
.88 .................................................................................. 22.352
4.56............................................................................ 115.824
29/32 (.90625)................................................................ 23.019
4.88............................................................................ 123.952
1.0 ..................................................................................
25.4
5 1/8 (5.125) .............................................................. 130.175
1 1/8 (1.125)................................................................... 28.575
5 1/2 (5.5)
139.7
1.5 ..................................................................................
28.1
6.0..............................................................................
152.4
1.75 ................................................................................
44.45
6.40............................................................................
162.56
2.0 ..................................................................................
50.8
6.5..............................................................................
165.1
2.12 ................................................................................ 53.848
7.0..............................................................................
177.8
2 3/16 (2.1875)............................................................... 55.563
7.9..............................................................................
200.66
2.22 ................................................................................ 56.388
8.0..............................................................................
203.2
2.28 ................................................................................ 56.912
8.68............................................................................ 220.472
2.44 ................................................................................ 61.976
9 17/32 (9.84375) ...................................................... 250.031
2 3/4 (2.75).....................................................................
69.85
11.5............................................................................
292.1
FIGURE 17 – TABLE OF METRIC EQUIVANENTS FOR DIMENSIONS (INCHES)
spacer blocks are marked to assure reassembly in
original position.
5.
Loosen main bearing retainer plate screws in
ends of eccentric shaft. Do not remove the
retainer plate screws. Leave about 1/4” (6 mm)
space between eccentric shaft and retainer plates.
6.
Spread frame slot approximately 1/64” (.4 mm) by
means of hydraulic or screw jacks (FIGURE 15,
page 19). Be sure to protect faces of frame
slots against damage from jacks. This is
important.
7.
Support eccentric and gear assembly in original
position by means of a sling, hoist or blocks
(FIGURE 15, page 19).
8.
Connect a 10,000 PSI (703.1 kg/cm
2
)hydraulic oil
pump (BlackHawk P76 or equivalent) to 3/8” pipe
tap in end of eccentric shaft after removing
protective plug. There is a clearance hole through
the retainer plate.
9.
Hydraulic pressure will loosen bore of the main
bearing on the tapered shaft.
10. With bearing loose on the shaft taper, the retainer
plates should be removed. They are heavy, so
suitable provisions must be provided to handle
them. Lifting devices shown in FIGURE 16, page
19, are useful in disassembly as well as during
assembly.
11. Eccentric and gear assembly, with the connecting
rod bearings on it, can now be lifted and shifted to
remove it from the frame. Be sure to protect
frame slot faces with a sheet material to
prevent damage to them and to the tapered
eccentric shaft. THIS IS IMPORTANT.
It will be necessary to raise or lower and shift the
suspended connecting rods to clear the eccentric
during removal.
After eccentric assembly has been removed from
the frame, remove outer cam bearings from their
inner races. They might slide off and be damaged
or injure someone.
12. Set eccentric assembly in a clean place so work
can proceed on it.
13. It is essential that every effort be taken to protect
all roller bearing from dust and dirt by keeping
them wrapped in sheet plastic or clean paper. Be
certain to cover the bearings if they are to remain
out of the frame for hours, such as overnight.
ECCENTRIC CAM BEARINGS - These bearings are
mounted on, and remain with the eccentric and gear
assembly during dismantling and reassembly of the
power end. The bearings are of the cylindrical roller
type, with the rollers retained in the outer race. The
inner races are shrunk on the eccentric cams.
The outer races with rollers slide off the end or outer
eccentric cam bearing inner races. The center bearing
is slipped over the adjacent eccentric cam after its
bearing race has been removed.
Inner bearing races can be removed by heating evenly
all around with torches. If bearings are to be use again,
be careful no to discolor the inner race with excessive
heat. “Spit-frying” hot is sufficient. Handle with gloves.
The center bearing inner race is slipped over the
adjacent end cam while it is still hot and after the end
bearing inner race has been removed.
These bearings are not preloaded and must have
running clearance. Check with feeler at bottom and