Harrington Hoists and Cranes Static/Dynamic Hoist Load Tester - Manual (Page 14)

14
Step 4: Continued - If the hoist is a competitors model select the cord assembly that
has one 5P plug on one end and wire pig tails on the other end. Place the 5P
plug into the receptacle on the enclosure on the hoist test stand. Remove the
cover from the electrical enclosure of the competitors hoist and attach the
wire matching the labels on the wires to the corresponding function of the
hoist.
Never use the pendant that was provided with the hoist to perform
the load test. Using the pendant provided with the hoist will bypass
the limit switch on the hoist load tester. This could cause overload
and possible damage to the hoist and the tester which could cause a
serious accident.
Step 5: Connect power source to hoist that is to be tested.
Step 6: Connect the hoist load tester to the power supply. Depress the black button
on the electrical enclosure and allow the accumulator to charge until the
maximum pressure is reached and the pump motor shuts off.
Step 7: Adjust the reducing valve knob, item 10 on drawing 50924 page 30, to the
hoist lift pressure setting for the appropriate model and capacity of the hoist
(see calibration chart). Whenever adjusting the pressure setting, make sure
that the pressure value is reached by adjusting from a lower value to a higher
value.
Step 8: Slide the chain particle restraint, item 40 on drawing 50979-1, over the bot-
tom hook and load chain and attach the chain particle restraint hook to the
hoist.
Step 9: Attach the bottom hook to the corresponding bottom master link. Ease any
slack from the load chain by gently depressing the up button of the hoist load
tester pendant. Avoid sudden loading of the hoist and test stand. After all
slack is removed form the load chain depress the up button and hold until the
rod of the hydraulic cylinder has extended approximately 3 3/4" inches.
Adjust the reducing valve knob, item 10 drawing 50924, to the hoist lower
pressure setting, and leave the hoist suspended for 30 to 60 seconds, This
ensures that the hoist brake holds 125% of its rated capacity.
Lower the hoist approximately 3" and leave the hoist suspended for 30 to 60
seconds. The test procedure is now complete and the hoist has been tested
both statically and dynamically.