35
08
Disassembly and Reassembly
Manual 2006 Rev B p/n 2006
To install the driven gear, align the reference
marks as shown in
Figure 5-5
. Install the
driven gear carefully to avoid mashing any
teeth when engaging the opposite gear.
21.
Install the washers and flat-head allen screws.
22. Remove the assembly from the press and
stand it on the work table with the gears down.
Place blocks under the end plate to prevent
the assembly from falling over. The drive gear
should remain on the left side.
23.
Place a small bead of an RTV silicone type
sealer around the periphery of the end plate
and encircling each bolt hole.
24. Install the rotor housing and secure with four
screws evenly spaced.
25. Check clearances between the end of the
lobes and the housing using a flat bar and
feeler gauges or a depth micrometer.
See
Figure 8-4
for free end clearances.
Free End Assembly
26. On single and double envelope series, put
sealer on the free end plate (same as step 15).
27. Install the free end plate and secure it with 4
screws.
28. On single and double envelope series, repeat
step 7.
29. In blowers that have mechanical face seals,
install the bearing spacers (0.063 in. [0.06 mm]
thickness) on each shaft. Lubricate the shafts
and tap on the bearings.
30. Install the oil retainer rings with button-head
screws.
31. Install the oil slinger on lower rotor (either
shaft on vertical-flow blowers), spacer on the
opposite shaft, washers, and screws.
Adjusting Rotor Interlobe Clearance
32. Lay the blower down with the drive gear on
the left. Using feeler gauges, take interlobe
readings and record on each side of housing
as indicated in
Figure 8-4
. By removing or
adding shim behind the 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 0.006 in. (0.16 mm) will change
the rotor lobe clearance one-half the amount:
0.003 in. (0.08 mm).
EXAMPLE:
See Figure 8-4
, check the
clearance at AA (left-hand reading) and BB
(right-hand reading). If AA reading is 0.003 in.
(0.08 mm) and BB reading is 0.009 in.
(0.24 mm), by removing 0.006 in. (0.16 mm)
of shim, the readings will change one-half the
amount removed or 0.003 in. (0.08 mm). AA
should then read 0.006 in. (0.16 mm) and BB
should read 0.006 in. (0.16 mm). The final
readings should be within 0.002 in. (0.05 mm)
of each other.
To determine the amount of shim to add or
remove, subtract the smaller figure from the
larger. If the right side reading is higher than
the left side, remove shim. If the right side
reading is lower, add shim.
Figure 8-4 – Checking Rotor Interlobe Clearance
Summary of Contents for M-D Pneumatics PD Plus
Page 6: ...iv Table of Contents Manual 2006 Rev B p n 2006 ...
Page 61: ...55 Assembly Drawings Manual 2006 Rev B p n 2006 Model 3200 Standard Seals Side and End Views ...
Page 64: ...58 Assembly Drawings Manual 2006 Rev B p n 2006 Model 4000 Lip Labyrinth Side and End Views ...
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