Gear End Assembly; Adjusting Rotor Interlobe Clearance - Gardener Denver D807 Service And Repair Manual

ASSEMBLY (Continued)

Gear End Assembly

4. Stand rotors in press with gear ends up. It is advisable
to rest the rotors on the lobe ends rather than the shaft
ends. Drive rotor should be on the left in a horizontal
position and the driven rotor vertical.
keyways are facing in the direction shown in Figure 2.
Lubricate shaft ends with oil so that seals are not
damaged on assembly.
DRIVE
5. Carefully install end plate (5) over shafts.
CAUTION: Make sure the two ½" diameter oil drain
holes on the face of the end plate are positioned at
approximately four o-clock.
6. Lubricate shafts and install bearings (9) with bearing
numbers up. If no bearing number appears on either
side, look for a small acid mark (dot). This mark must
be up.
CAUTION: These bearings have been flush ground
on one side. Do not use standard bearings which
have not been flush ground within .001 tolerance.
(This modification is not reflected in the universal
bearing number, use factory approved parts.)
7. Install bearing retainer rings (14), with cutoffs facing
drain hole, and oil deflector plate (15) on driven plate
(right-hand side). Secure with cap screws (61) and flat
washers (62).
8. Check clearance between the face of the end plate and
rotor lobes. See clearance chart. If clearances are not
within specifications, recheck parts to find cause of
improper clearance before proceeding.
9. Install gear keys (24) in rotor shaft keyways flush with
top of rotor shaft. Lubricate shafts.
10. Some models are fitted with split gears which incorporate
a locking tab that engages the gear alignment dowels.
On this model, the locking tab must be left in place while
removing or installing the gear hub. This will allow the
dowel pins to be retained to the outer gear shell.
Disassemble split gear. Install driven gear (right-hand
helix).
11. Install washers (25) and secure with cap screws (29)
Make sure 12. Remove assembly from press and stand on work table
13. Install housing (3) over rotors, making sure dowel pins
Fig. 2
14. Check end clearance with depth micrometer with a flat
DRIVEN
15. Wrap keyways with cellophane tape. Install drive end

Adjusting Rotor Interlobe Clearance

16. The driven gear is made of two pieces. The outer gear
4
To install drive gear hub, align reference marks as
shown in Figure 1B. Carefully install split gear to avoid
mashing any teeth when engaging opposite gear.
using a few drops of Loctite #242 (removable thread
locker) on each screw.
with gears down. Place blocks under end plate to
prevent assembly from falling over. Drive gear should
remain on left side.
(22) are still in place and punch marks are lined up. It
is not necessary to use a sealant on either side of
housing. Secure temporarily with four evenly spaced
hex head cap screws M10 x 25mm p/n 128010425.
bar or feeler gauges.
plate, making sure dowel pins (22) are still in place and
the punch marks are in line.
CAUTION: Make sure the two ½" diameter oil drain
holes on the face of the end plate are positioned at
approximately four o-clock.
Remove tape and install oil slinger on bottom shaft,
securing grub screws by using a few drops of Loctite
#242 (removable thread locker) on each screw. Install
drive end cover (6) using silicone sealant and secure
with capscrews and washers ( 27 & 301).
shell is fastened to the inner hub with four cap screws
and located with two dowel pins. Some models are
fitted split gears which incorporate a locking tab that
engages the gear alignment dowels. On this model the
locking tab must be left in place while removing or
installing the outer gear shell. This will allow the dowel
pins to be retained to the outer gear shell. A laminated
shim, made up of .003 laminations, separates the hub
and the shell. By removing or adding shim laminations,
the gear shell is moved axially relative to the inner hub.
Being a helical gear, it rotates as it is moved in or out
and the driven rotor turns with it, thus changing the
clearance between rotor lobes. Changing the shim
thickness .014 will change the interlobe clearance
approximately .005.