Milwaukee 9566, 9572, 9573, 9571 Limit Switch Adjustment, Chain Replacement with No Chain in Hoist

Milwaukee Electric Tool Corporation

13135 West Lisbon Road

Brookfield, Wisconsin 53005

TEL: (800) 729-3878

Chain Replacement with No Chain in Hoist

Refer to Figures 4 and 5.

1.DISCONNECT HOIST FROM POWER SUPPLY and move hoist to a work table. Do not remove the electrical cover.

2.Lay the hoist on its side and remove the four screws that attach the sheave housing to the gear housing (See Figure 12, Ref. No. 2).

3.Carefully pull the sheave housing and motor assembly loose from the gear housing.

There are wires running through the hoist. Carefully ease the hoist sections apart. Do not jerk them apart.

4.Turn the two hoist sections at right angles and remove the chain guide screws on the nearest chain guide (Ref. No. 1, Figure 5).

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Figure 5 — Chain Replacement with No Chain in Hoist

5.Remove the two chain guide plate screws (Ref. No. 2) and the nearest chain guide plate. Be careful not to lose the two spacers that are between the chain guide plates.

NOTE: Inspect chain guides and load sheave for wear, replace as needed.

6.Lay the new chain over the load sheave. Allow about 15" of chain below the hoist on the slack end (See Figure 4). Be sure the welds of the upstanding links are out away from the load sheave and that proper orientation is observed for attachment of the dead end. Also be sure the load hook assembly (if already attached to the chain) is toward the center of the hoist or to your right as you face the load sheave.

7.Replace the chain guide plate and the chain guide. Grease the splined shafts that project from both the housing and the motor.

8.Place the motor coupling on the splined shaft and carefully fit the two hoist sections together. Be sure the dead-end nut, the top hook and the support screw (double-chained hoists only) are all in place. On single-chained hoists, the hook shank goes in the center hole; on double-chained hoists, it goes in the off-center hole (See Figure 4). Be careful not to pinch any of the wiring. Turn the hoist on its side and replace the four screws and tighten securely.

9.Follow steps 11 through 14 in the previous section, CHAIN REPLACEMENT WITH CHAIN IN HOIST, to complete the chain replacement procedure.

LIMIT SWITCH ADJUSTMENT

IMPORTANT: Before placing hoist in operation, check the limit switch adjustment. Limit switches are provided to protect the hoist against damage resulting from overtravel or to allow setting the hook travel within the factory-set limits of travel. For easy identification and association with the proper direction of travel, the upper and lower limit switch adjusting nuts are color- coded gold and silver respectively. Each limit nut has 10 slots for fine adjustment, and the increment of adjustment is such that one slot is equivalent to approximately one link of chain travel. Movement of the limit switch nuts toward or away from each other increases or decreases the hook travel respectively. Care should be exercised when adjusting either limit of travel.

If the wires running to the limit switches are ever disconnected for any purpose, be sure to replace wires in accordance with the correct wiring diagram (See WIRING DIAGRAMS, page 12).

Adjusting Upper Limit (Gold Nut)

Refer to Figure 3.

1.Suspend the hoist. For single-chained models raise the load block until there is a minimum clearance of 2" from the hoist housing and the top of the block. Double-chained models require a minimum clearance of 1" from the chain support to the top of the load block.

2.DISCONNECT HOIST FROM POWER SUPPLY and remove the electrical cover.

3.With a screwdriver, pry the spring guide plate out of the slots in the limit switch nuts.

4.Turn the slotted gold nut toward its limit switch until the switch “clicks” then turn two slots farther. Release the spring guide plate and be sure it slips back into the slots in both limit switch nuts. Do not disturb the silver slotted nut if it has been set previously.

Adjusting Lower Limit (Silver Nut)

Refer to Figure 3.

1.Suspend the hoist. Carefully lower the load block to a point where the slack-end loop of the chain hangs down 6" or more from the hoist housing (or the limit desired in any particular application allowing the minimum 6"). There should be a minimum clearance of 1½" between the chain stop and the bottom of the hoist.

2.DISCONNECT HOIST FROM POWER SUPPLY and remove the electrical cover.

3.With a screwdriver, pry the spring guide plate out of the slots in the limit switch nuts.

4.Turn the slotted silver nut toward its limit switch until the switch “clicks,” then turn two slots farther. Release the spring guide plate and be sure it slips back in the slots in both limit switch nuts. Do not disturb the gold slotted nut if it has been set previously.

Check Both Upper and Lower Limits

1.Connect the hoist to the power supply. Be sure the green ground wire is properly grounded .

2.Check load hook direction (See INSTALLATION 2-c, page 5).

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