MA Series part 1 - Coffing Hoists, Coffing Hoist Parts
MA Series part 1 - Coffing Hoists, Coffing Hoist Parts
MA Series part 1 - Coffing Hoists, Coffing Hoist Parts
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TABLE IV. TROUBLESHOOTING CHART,rw-IF DISASSEMBLY OF UNIT IS REOUIRED, REFER TO PARAGRAPH 4-13. TEST HOIST PER PARAGRAPH 2_6AFTE REASSEMBLY OR REPLACEMENT OF ANY OF ITS COMPONENT PARTS.SYMPTOM1. <strong>Hoist</strong> raises but will notlower.POSSIBLE CAUSE(S)"Brake Lock-Up" caused by shockload, leaving load on hoist forextended periods of time or removingload from hoist withoutslacking chain.2. <strong>Hoist</strong> lowers erratically. (a) Brake friction surfaces arecontaminated with oil orgrease.(bl Brake discs are worn or glazed.3. <strong>Hoist</strong> requires excessiveeffort to raise or lower.4. Hoi st wi ll mt raise orlower.5. <strong>Hoist</strong> "Free Chains"under load.6. <strong>Hoist</strong> diff icult to "FreeChain".(a) Overloading(b)Worn or danraged load chain.{c) Load Chain rusty or coatedwith foreign material.(d) Load sheave or guide portionof housing have build-up offoreign material.(e) Worn gearing or bearings.(a) Chein jammed in housing(bl Eroken load sheave(c) Broken or worn tip on handlepawl or stripped spline onbrake hub.(a) Load pawl not engaged (freechain lever sticks)(b) Brake hub not operating freely.(c) Load chain installed fromwrong side of load sheave.See 3 (b) (c) & (d)CORRECTIVE ACTIONUnlock brake following procedureoutlined on Page 3. Check applicationfor conditions suggested in"Possible cause(s!".(a) Replace brake discs and wipemating friction surfaces clean.(b) Replacebrake discs if wornexcessively. remove glaze byplacing a fine grade emorycloth on a flat surface andrubbing discs lightly on thissurface.(a) Reduce load or use correctcapacity unit.(b) Check chain per instructionson Page 5 and replace ifnecessary.(c) Clean chain with suitable acidfreesolvent and relubricate.Replace chain if badly pittedwith rust.{d) Disassemble <strong>part</strong> and clean outforeign material. Inspect andreplace <strong>part</strong>s if wornexcessi vel y.(e) Disassanble <strong>part</strong>s and checlrfor wear. Replace <strong>part</strong>s ifnecessary and relubricate.(al (b) & (c)Di sassemble per instructions.Inspect <strong>part</strong>s for wear orbreakage and replace ifnecessary.(a) Check load pawl shaft forbinding condition. Check forbroken load pawl or load pawlspri ng.(b) Check thread in brake hubor mating <strong>part</strong> for damage,corrosion or foreign material.Check for broken or irnproperlypositioned threadstop. (See Fig. 4-6)(c) Correct chain reeving.(See Fig. 4-8)See 3 (b) (cl & (d)Americrane & <strong>Hoist</strong> Corp 1-800-652-193211
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