CAMCORP Blower Package with Roots Blower - Manual (Page 38)

15 ©2002 Dresser, Inc. all rights reserved.
ROOTS, RAM, URAI and WHISPAIR are trademarks of Dresser, Inc.
Dresser Design and Universal RAI are registered trademarks of Dresser, Inc.
It is recommended that major repairs be performed at
an authorized ROOTS facility. However, it is recognized
that this may not always be practical. If a blower is
out of warranty, mechanical adjustments and parts
replacement may be undertaken locally at the owner’s
option and risk. It is recommended that ROOTS
™ parts
be used to insure fit and suitability. The maintenance
of a small stock of on-hand spare parts can eliminate
possible delays. When ordering parts give Item
numbers and their word descriptions from sectional
drawings and parts lists. Also specify quantities
wanted and the blower size and serial number from
the nameplate.
Repairs or adjustments are best performed by
personnel with good mechanical experience and the
ability to follow the instructions in this manual. Some
operations involve extra care, patience, and a degree
of precision work. This is especially true in timing
impellers and in handling bearings. Experience
indicates that high percentages of bearing failures
are caused by dirt contamination before or during
assembly. Therefore, the work area should be cleaned
before starting disassembly, and new or re-usable
parts protected during progress of the work.
In the following repair procedures, numbers shown
in brackets ( ) correspond to the Item numbers
used in assembly drawings, and parts lists. It is
recommended that the procedures be studied carefully
and completely, with frequent reference to the draw-
ings, before starting work. This will produce better
efficiency through an understanding of what work is to
be done, and the order of doing it. Before disassembly,
mark all parts so that they may be returned to original
locations or relative positions.
Requirements for special tools will depend on the work
to be done. If impeller clearances and float are to be
checked or re-set, a dial indicator and a set of long
feeler gauges will be needed. Work involving removal
of the timing gears cannot be accomplished without a
puller suitable. Heat must be used during bearing and
sleeve installation.
Design of ROOTS ™ blower is simple, and most repair
operations are straightforward. For this reason, the
following procedures are intended mainly to indicate
a preferred work order and to call out points to be
observed. Where special operations are required,
detailed coverage is given.
DISASSEMBLY OF DRIVE END
1. Remove the sheave or coupling and key from the
drive shaft. File off any burrs or sharp edges along
the keyway.
2. Drain oil by removing drain plug (22).
3. Remove the flange screws (75). Tap the drive end
cover to loosen it, then slide it along the shaft care
fully to avoid damaging the lip seal (33) on the
drive shaft keyway. Remove the gasket (7).
Remove oil slinger (40) and cap screw (60).
4. Remove bearing clamp plates (34) by unscrewing
capscrews (32) and removing lock washers (35).
Keep shim halves (10) together exactly as removed
by tagging them with each clamping plate.
5. Remove the headplate – remove all capscrews
(23) holding headplate to the cylinder. Insert
jacking screws into the four threaded flange
holes and turn them in evenly. The headplate will
separate from the cylinder. The lip seals (27), and
bearing outer race and rollers, are removed with
the headplate and can be pressed out later.
6. Remove the bearing inner race and sleeve (38)
from the shaft with aid of a bearing puller by
inserting the puller jaws in the groove in the sleeve
and applying the jacking screw against the end of
the shaft. Protect the threaded hole and the end
of the shaft with a small, flat spacer between the
shaft and the puller.
DISASSEMBLY OF GEAR END
1. Drain oil completely from the gearbox sump by
removing plugs (22) in bottom of the headplate (1).
2. Loosen all flange screws (75) in the gearbox and
remove all but two upper screws. Bump the gear
box to break the joint if it cannot be pulled free by
hand, then remove the last two screws and lift off
the gearbox. Remove gasket (7).
3. Removing gears: CAUTION: Do not remove gear
nuts (31) completely before the gears are unseated
from the taper fits or damage/injury may result.
Be sure that each gear is marked for return to the
same shaft in the same angular position and that
the gears have match marks for the teeth. For this
operation, the impellers should be wedged as
shown in Figure 8. Back off nuts (31) and slinger
(46). The timing gears (4) have two 1/2” – 13 holes
for pulling purposes. Use a suitable puller.
4. Remove bearing clamp plates (54) by unscrewing
capscrews (32) and removing lock washers.
Group the shims (10), the wavy spring washers
(29) with each clamp plate and tag for ease of
reassembly.
5. Remove the headplate – remove all capscrews
23) holding the headplate to the cylinder. Insert
jacking screws into the four (4) threaded flange
holes and turn them in evenly. They headplate will
separate from the cylinder. The lip seals (27), and
bearing outer race and rollers, are removed with
the headplate and can be pressed out later.
For RAM ™ -J WHISPAIR ™ gas pump units:
The gear end headplate which is removed next
requires a different approach from the drive end.
On this end, the shafts are forced from the bearing
bore by using a bar across the end of the shaft
with threaded rods to the headplate. Once the
headplates are removed from the assembly, the
seal housings can be pressed or driven from