Assembly, Adjustments And Mounting - Harrington Hoists RHN02D-20A-20D Series Owner's Manual

3.4

Assembly, Adjustments and Mounting


When installing the trolley hoist on a beam, ALWAYS raise the hoist into position with the
trolley assembled together and securely attached to a pallet. Raise the trolley hoist with a forklift, lifting platform,
or other similar means. NEVER use slings to raise and install the trolley hoist onto the beam (see
Using a forklift or another suitable means, position the pallet so that the horizontal axis of the beam is parallel to
the horizontal axis of the hoist (see
Note: Unless specified when ordered, the RHN Trolley hoist is factory set to accommodate a 12 inch (306mm) beam
flange. If a smaller flange width is necessary, the driveshaft position and/or length may require a change as well (See
Table 3-1). If the supplied trolley drive shaft is too long for the desired flange, a short trolley drive shaft can be ordered, or
the existing shaft can be cut down to the appropriate length. Use caution and always wear eye protection when cutting
the trolley drive shaft with a powered saw or a manual saw. Deburr the cut end of shaft before reinstalling. The RHN is
equipped with the maximum number of counterweights necessary for the standard (advertised) flange range for each
capacity. If the flange range exceeds 12 inches (306mm), some counter weight may need to be removed to achieve
proper balance.
3.4.1 RHN Trolley Hoist Installation
1) Make sure the mounting location complies with
2) Before attempting to install the trolley hoist, verify beam width and the "c" dimension (see
See Table 3-1
Section 3.4.1 (step 8).
3) Determine the correct driveshaft length for your application.
a. If a shorter driveshaft length is required, it is necessary to replace or cut the existing driveshaft to the
appropriate length. (See
b. If a longer driveshaft length is required, it is necessary to replace the existing driveshaft with one of
the appropriate length. (See
4) Determine the correct Snap Ring Position on the driveshaft, for your application. (2 ton – 10 ton)
Each driveshaft has multiple Snap Ring positions shown as X3 and X4. These different positions allow
the Trolley Driveshaft to be inserted at two different depths within the motor housing. This gives the
drive shaft the ability to accommodate a range of beam flange widths before it necessary to change the
shaft length.(See
5) Accessing the Drive Shaft for replacement, shortening and/or Snap Ring relocation.
a. Carefully remove the trolley motor by loosening and removing the 4 trolley motor mounting bolts. It
may be necessary to disconnect the trolley motor cable, if there is not enough slack to allow for the
motor to be safely supported, as work is being performed. With the bolts removed, the motor can
slide off of the drive shaft.
b. With the motor removed and safely placed out of the way, the driveshaft can pulled out of the trolley
assembly.
6) Adjust the trolley flange to fit beam width.
a. Working on the trolley motor side of the hoist, (the side closest to the large rectangular counter
weights), loosen the nuts (2) on the two threaded shafts (1) of the trolley hoist. DO NOT loosen the
nuts closest to the hoist. NEVER move the hoist side of the trolley. (See
3-11)
Figure 3-5)
for dimensions respective values. If adjustment is not necessary, move onto section
If adjustment is necessary move onto
Table 3-2)
Table 3-2)
Table 3-2)
Section 3.3.
step 3,
22
Figure
Figure
below.
Figure 3-6 and Figure
3-4).
3-6).