Repair
Actual repairs are limited to the removal of small burrs and other minor surface imperfections from gears and shafts. Use a fine stone or emery cloth for this work.
1.Worn or damaged parts must be replaced. Refer to the applicable parts listing for specific replacement parts information.
2.Inspect all remaining parts for evidence of damage. Replace or repair any part which is in questionable condition. The cost of the part is often minor in comparison with the cost of redoing the job.
3.Smooth out all nicks, burrs, or galled spots on shafts, bores, pins, and bushings.
4.Examine all gear teeth carefully, and remove nicks and burrs.
5.Polish the edges of all shaft shoulders to remove small nicks which may have been caused during handling.
6.Remove all nicks and burrs caused by lockwashers.
Assembly
Load Sheave Assembly
1.Apply grease to roller bearings and position them in the groove of the bearing race located on the gear end of the load sheave.
2.Install load sheave in side plate, ensure roller bearings remain in position.
3.Install
4.Apply grease to the second set of roller bearings and position them in groove of the bearing race located on the plain end of the load sheave. The same number of roller bearings must be used on either side of the load sheave.
5.Carefully install side plate assembly to engage the locating diameters of parts installed in steps 3 and 4. Ensure all roller bearings remain in position.
6.Install lockwashers and nuts and tighten.
Slip Clutch Assembly
1.Place double cone onto pins in handwheel and press until seated.
2.Insert screws through double cone and tighten.
3.Insert single cone into double cone along with spring.
4.Insert support through backside of double cone. Thread nut onto support loosely.
5.Slide this assembly onto pinion shaft and secure with nut and cotter pin.
6.Refer to ‘Adjusting Slip Clutch’ for adjustment procedures.
Gear End Assembly
Follow steps 1 through 6 described in ‘Load Sheave Assembly’.
1.Install gear on load sheave. Ensure recessed side of gear face is outward. Install retainer ring on load sheave to secure gear.
2.Install pinion shaft through the center of load sheave.
3.Install gears so gear teeth are correctly timed and end shafts are located in bearing sleeves in side plate. Refer to ‘Gear Timing’ section on page 11.
4.Apply a thick coat of grease as recommended in the “LUBRICATION” section to all gear teeth. Install support plate over gears to engage gear end shafts.
5.Secure support plate with nuts and lockwashers.
6.Install the gear cover. Secure with three nuts and screws.
Brake End Assembly
Follow steps 1 through 6 described in ‘Load Sheave Assembly’ and steps 1 through 6 described in ‘Gear End Assembly’, then below steps.
CAUTION
•The brake will not operate properly if there is oil on the brake discs.
1.Thread brake hub onto pinion shaft until snug. Stepped side of brake hub must face out.
2.Install first brake disc followed by ratchet disc and second brake disc. Ratchet disc teeth must engage the two pawls mounted on side plate assembly. Counterclockwise rotation of the ratchet disc must be possible.
3.Secure load sheave to prevent rotation and thread handwheel onto pinion shaft and secure with nut. Tighten nut until snug and then back nut off until first slot is aligned with pin hole in pinion shaft. Install cotter pin and bend ends apart.
4.Wrap hand chain around handwheel and feed ends through slots provided in hand chain wheel cover. Install the handwheel cover. Secure with three nuts and screws.
Bottom Hook Assembly (2, 3 and 5 ton hoists only)
1.Grease and install the rollers in the groove provided in the bore of the idler sheave.
2.Install idler sheave shaft through the idler sheave bore. Ensure rollers remain in position.
3.Carefully place the assembled parts between the plates.
4.Install hook between plates and clamp plate halves together with capscrews, lockwashers and nuts.
Gear Timing
For proper operation, timing marks on the gears must be in the correct positions. The timing marks are circular impressions on the faces of gears. Refer to Dwg. MHP0833 on page 11.
(Dwg. MHP0833)
MHD56391 - Edition 2 | 11 |
