16
Laboratory Exhaust Systems
®
Jib Crane Assembly
(Optional Accessory)
The jib crane is mounted
to sockets provided on
the plenum housing.
When assembling the jib
crane, use the socket
closest to the fan
which is to be serviced
(multiple sockets are on
plenums consisting of
three or more fans). Jib
crane is designed to
lift windband and
motor only. Any
other use may
result in serious
injury. Jib crane
must not be
used to lift the
fan from the
plenum.
NOTE
Complete assembly instructions for the jib crane are
documented in Assembly Instruction #472081, Jib
Crane for Vektor. Instructions are shipped with the jib
crane or can be found online at greenheck.com under
the library section.
V-Belt Drive Installation
Belt Drive
1. Remove the protective coating from the end of the
fan shaft using mineral spirits or another similar
solvent. Check to ensure that the shaft is free of
nicks and burrs.
2. Slide sheaves on shafts - do not drive
sheaves on as this may result in
bearing damage and void the
warranty.
3. Align fan and motor
sheaves with a straight-
edge or string and tighten.
4. Place belts over sheaves.
Do not pry or force belts,
as this could result in
damage to the cords in
the belts.
5. Adjust the tension until the belts appear snug. Run
the unit for a few minutes and allow the belts to “set”
properly.
6. With the fan off and disconnect locked out, adjust
the belt tension by moving the motor pivot plate.
When in operation, the tight side of the belts should
be in a straight line from sheave to sheave with a
slight bow on the slack side.
Aligning Sheaves with
a Straight Edge
Radial Gap and Alignment
Efficient fan performance can be maintained by having
the correct radial gap and alignment. These items
should be checked before start-up when the unit has
been disassembled.
Radial Gap:
Adjust inlet cone position such that the
radial gap between the wheel cone and inlet cone is
evenly distributed around the wheel.
Alignment:
If necessary, adjust wheel position by
loosening the wheel hub from the fan shaft so that a
straight edge held tight to the wheel cone just touches
the inlet cone.
Straight Edge
Wheel Cone
Inlet Cone
Radial Gap
