Harrington Hoists RHN02D-20A-20D Series, Owner'S Manual

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
Lower bottom hook block to desired hook position, if necessary turn setscrew (S2) to the left
before hand.

Turn setscrew (S2) to the right until contact S2 switched audibly

Check disconnect point
Figure 3-21
3.8.8 Servicing limit switch

Maintenance work is restricted to checking the cut-off points. No maintenance or inspection is
necessary for the gear limit switch itself

Any dust deposits that may be visible when the housing is opened must on no account be removed
with compressed air as this would force the dust into the contacts and impair the switching function

Benzene or other solvents MUST NOT be used to clean the limit switch!
3.9 Pre-operational Checks and Trial Operation
3.9.1 Refer to the trolley hoist’s nameplate and record the Product Code, and Serial Numbers in the
space provided on the cover of this manual.
3.9.2 Perform pre-operational checks for the trolley hoist:


Confirm the adequacy of the rated capacity for all slings, chains, wire ropes
and all other lifting attachments before use. Inspect all load suspension members for damage
prior to use and replace or repair all damaged parts.


Verify and correct all wire rope irregularities prior to operating the hoist. Refer
to Section 3.6.

Measure and record the “k” dimension of the bottom hook on the hoist. See Table 5-5 under
Section 5 .

Ensure that trolley is properly installed on the beam, and stops for the trolley are correctly
positioned and securely installed on the beam.

Ensure that all nuts, bolts and split pins (cotter pins) are sufficiently fastened.

Pull down on the Pendant and ensure that the Strain Relief Cable takes the force, not the
Pendant Cord.


Check supply voltage before everyday use. If the voltage varies more
than 10% of the rated value, electrical devices may not function normally.