11
Gear Setting Procedure
The proper mounting of the gear set is essential to obtain long
life and smooth operation of the gears. The pinion and ring gears
were positioned approximately in the preceding steps. The correct
gear position is determined by the gear tooth contact pattern and
by the backlash.
With the "X" marked tooth on the pinion gear engaged between
the two "X" marked teeth on the ring gear, check the backlash
with a dial indicator as shown in
Figure 6
. Lock the pinion shaft
against rotation. The amount of movement of the fan shaft, mea-
sured at a distance equal to the outside radius of the ring gear
is the backlash. The backlash on the 6.50/1 gear set should be
between .013 and .018" (.33 and .46mm). The backlash on all
other ratios should be between .010 and .015" (.25 and .38mm).
With the "X" teeth engaged, the backlash should be approximately
in the middle of the allowable range. Check the backlash at three
other points around the ring gear to be sure the backlash is within
the specified limits. Adjust ring gear axially by removing or adding
shims (
420
) at bottom bearing retainer.
Note
—To maintain bearing adjustment corresponding shim (
420
)
adjustment must be made at the bearing retainer.
Example:
Removing .003" shims at the bottom bearing retainer
requires the addition of .003" shims at the top bearing retainer to
maintain correct bearing adjustment.
Recheck the backlash to make sure it is within the proper limits.
With gears adjusted to the proper backlash, blue (Prussian blue in
oil) the pinion teeth. By using a long handled brush or swab, the
pinion teeth can be reached through the inspection opening. Drive
the pinion by turning the fan shaft in both directions for several
revolutions. Observe the markings on both gears on both sides of
the teeth. Compare the markings with the contact pattern shown
in
Figure 7
.
If contact pattern is incorrect, adjust the pinion position with shims
between the pinion cage cap and Geareducer case.
When tooth contact is correct, recheck backlash. If necessary,
adjust ring gear to obtain proper backlash and recheck contact
pattern. Proper contact is more important of the two. On a used set
of gears, it may be necessary to set the gears with slightly greater
backlash in order to obtain proper tooth contact. Should a condi-
tion be encountered where correct contact cannot be obtained,
contact your local Marley sales representative for information on
factory repair service.
Final Assembly
1. Remove bottom bearing retainer cap and install the O-ring
(
503
). Reinstall the bottom bearing retainer cap and tighten
the cap screws to 25 ft·lb
ƒ
(34 N·m).
2.
For "S" Models Only:
Install wear sleeve (
521
) on water slinger.
3. Install O-ring (
502
) in water slinger.
4. Install water slinger on fan shaft (
8
).
5. Replace air vent and all pipe plugs.
6. Fill with lubricant selected from
Table I
.
COLLAR
SET SCREW
TOP VIEW
OF INDICATOR
POINT OF MEASUREMENT
OUTSIDE RADIUS OF GEAR
DIAL INDICATOR
Figure 6
Gear Backlash Measurement
field repair
Содержание Marley Geareducer 2200
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