Yale Series Y80 manual Inspect Rope Drum and Shaft

(1)Before installing spring in its retainer (Figure 5-9), apply a good grade of ball bearing grease to inside of retainer. Spring must be positioned exactly as illustrated, butted against pin at side of cam.

LOAD BRAKE — OVERLOAD CLUTCH

LOAD BRAKE — STANDARD

Figure 5-9. Load Brake Gear Removed From

Load Brake Showing Load Brake Spring.

(2)When installing pawl and ratchet assembly on load brake shaft, be certain that teeth on ratchet face are in the same direction as shown in Figure 5-8. The ratchet assembly should rotate freely when turned counterclockwise and the pawl should engage ratchet teeth when unit is turned clockwise.

(3)When installing brake flange, position it with chamfer facing friction disc (Figure 5-7).

Figure 5-10. Winding Load Brake Gear Using a Strap

Wrench to Set Up Load Brake Spring.

(4)The brake spring must be pre-loaded at assembly to a torque of from 10 to 14 lb.-ft. This is accomplished using a plumber’s strap wrench to wind (rotate) load brake gear to set up spring (Figure 5-10) while pressing brake flange into place using an arbor press. Clamp pinion end of shaft into a portable vise to keep brake from rotating in press. Use brass or copper jaw plates on vise to protect pinion gear teeth. Wind gear counterclockwise (viewing brake from flange end) with strap wrench and press down on flange until snap ring groove in shaft is exposed allowing snap ring to be installed. Use extreme care not to over wind spring as yield will result and final spring torque will be reduced. Do not wind gear beyond point necessary to install snap ring in groove.

h.Install gearing and load brake assembly in gearcase in reverse order of disassembly. Be certain roller thrust bearings are installed at both ends of intermediate gear shaft as shown in Figure 5-4 and that thrust washers are properly installed at both ends of load brake shaft as noted below:

(1)A steel thrust washer with 5/8" I.D. must be installed on the brake flange end (end opposite pinion) of load brake as shown in Figure 5-5.

(2)A bronze thrust washer with a lug on one side goes on pinion end of load brake shaft and it must be installed so that its lug engages the special slot located on the spot face surrounding the load brake bearing bore inside gearcase cover. Use heavy grease to hold it in place on cover as cover is installed.

On hoists with 18 or 20 tooth load brake pinion, an 11/ 16" I.D. steel thrust washer is installed between pinion and bronze thrust washer.

j.At completion of reassembly of gearing and load brake in gearcase, refill gearcase to proper level using correct grade of oil, as outlined in Section IV — LUBRICATION.

k.For hoists equipped with an overload clutch (optional) which has been functioning properly, visually inspect clutch adjusting nut and spring washer for signs of damage or looseness. With a small hex allen wrench, make certain two set screws in adjusting nut are tight. DO NOT TURN ADJUSTING NUT OR DISASSEMBLE CLUTCH. If spring washer, adjusting nut or gear is loose or damaged, or the clutch did not function properly before disassembly of hoist for inspection, consult the nearest YALE Authorized Repair Station for repair or adjustment.

5-7. INSPECT ROPE DRUM AND SHAFT.

a.To remove drum, remove wire rope, electrical

compartment cover and electrical panel assembly (Figure 9-1) and gearing and load brake assembly (paragraph 5-6).

b.Remove four hex socket head bolts securing gearcase to cover. Three bolts are accessible from inside frame (Figure 2-2, Section II) and the fourth is accessible from electrical end of frame thru special access hole using a socket hex key wrench with an extension (Figure 5-11). With bolts removed, pry assembled gearcase and motor from frame. Exercise caution so that gearcase and motor assembly does not fall as it comes free of frame. This disassembly operation is not recommended with hoist suspended. Drum will remain in frame and can be lifted from drum shaft. To remove shaft, remove internal retaining ring from bearing bore in frame.

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