Trouble Shooting - Coffing Hoists EMW Series Operating, Maintenance & Parts Manual

500 lbs capacity

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Table of Contents

HOOKS

Refer to Figure 1.

1. Inspect hooks once daily for cracking, extreme wear or

spreading. Replace hooks showing any of these signs. If the

throat openings are spread wider than the maximum

permissible 15% increase listed here, the hooks have been

overstressed and must be replaced. Any hook that is bent or

twisted more than 10 degrees from the plane of an unbent

hook must also be replaced.

N N o o r r m m a a l l " " X X " "

29/32"

Figure 1 — Hook

Inspection

2. The hook latches should be inspected to ensure that they

close the hook throat opening in a secure manner when a

load is applied. On the top hook, the hook collar should be

fully restrained by the retaining pin.

WIRE ROPE

Refer to Figure 2.

To remove the wire rope, loosen the setscrew (49). Remove

worn cable assembly (17) by pulling the cable from the drum

(4), through the cable guide (32) and the sheave (6), and

through the top of the suspension frame (1) after removing the

plug (47). NOTE: The bottom block (5) should be disassembled

by removing the two screws (44) for the installation of the

new cable.

Always disconnect unit from the power supply system before removing hoist covers or the back cover of control station.

––– Probable Cause –––

Hoist cuts off after several minutes of operation, but

will run again after several minutes

Brake will not hold, load drifts down.

Brake chatters

Hoist runs in wrong direction when pushbutton is operated.

For more information contact: Sievert Crane and Hoist, (708) 771-1600, parts@sievertelectric.com, www.sievertcrane.com

To install the new cable, insert the plain end of the cable

assembly through the opening in the suspension frame (1) and

pull the cable through the frame until swaged ball is seated in

the frame. Replace the plug (47) in top of the frame. Reeve the

cable around the sheave (6) and assemble the bottom block (5)

with the two screws (44). Position the drum as shown in Figure

2 and push the cable through the guide (32) and through the

top opening in the drum and back through the bottom opening

in the drum. While holding the cable in place, tighten the

setscrew (49) to 25 in. lbs. torque.

R R e e j j e e c c t t " " X X " "

LUBRICATION

Keep brake surface and brake lining free of grease.

Proper lubrication is necessary for a long and relatively trouble-

free hoist operation.

Wire Rope

Wipe clean with a clean cloth periodically and apply a light coat

of oil.

Drum

Apply a small amount of grease to drum shaft bearings (See

Figure 2, Ref. No. 39).

Gears

The gear housing is adequately lubricated at assembly with 1/3

pound of NLGI #1 grease. If relubrication becomes necessary,

use approximately 3/4 cup of light, semi-fluid grease.

Idler Shaft

Apply a small amount of grease to the bore of the idler sheave

(See Figure 2, Ref. No. 6) in the bottom block.