Air Chain Hoist 20944 Operating, Maintenance & Parts Manual ™ Capacities 250 lbs (113 kg) 300 lbs (136 kg) 500 lbs (226 kg) 600 lbs (272 kg) 1000 lbs (453 kg) Follow all instructions and warnings for inspecting, maintaining and operating this hoist. The use of any hoist presents some risk of personal injury or property damage. That risk is greatly increased if proper instructions and warnings are not followed.
Note: When ordering parts, always furnish Rated Load and Serial Number of hoist on which the parts are to be used. For the location of the nearest Repair Station, see the list located on the inside front cover.
CM HOIST PARTS AND SERVICE ARE AVAILABLE IN THE UNITED STATES AND IN CANADA As a CM Hoist user, you are assured of reliable repair and parts services through a network of Master Parts Depots and Service Centers that are strategically located in the United States and Canada. These facilities have been selected on the basis of their demonstrated ability to handle all parts and repair requirements promptly and efficiently. Below is a list of the Master Parts Depots in the Unites States and Canada.
SAFETY PRECAUTIONS Each ShopAir Chain Hoist is built in accordance with the specifications contained herein and at the time of manufacture complies with our interpretation of applicable sections of *American Society of Mechanical Engineers Code (ASME) Performance Standard for Air Chain Hoists HST-5M, Overhead Hoists B30.16 and the Occupational Safety and Health Act (OSHA). Check each installation for compliance with the application, operation and maintenance sections of these articles.
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SPECIFICATIONS • • • • • • • • • • • • • • Product Code 2178 Capacity Lbs. (kg.) 250 (113) Full Load Hoist Speed fpm (mpm) 33 (10.0) Full Load Lowering Speed 68 (20.7) DIMENSIONS IN. (mm) A B IN. (mm) IN. (mm) 107/8 (276) 37/8 (98) Number of Load Chains 1 Shipping Weight LBS. (kg.) 30 (13.6) 2180 300 (136) 30 (9.1) 62 (18.9) 107/8 (276) 37/8 (98) 1 30 (13.6) 2182 500 (226) 20 (6.1)) 57 (17.4) 37/8 (98) 53/4 (146) 53/4 (146) 1 30 (13.6) 2 34 (15.4) 47 (14.
ACCESSORIES GENERAL INFORMATION The ShopAir Hoists are precision, air operated link type chain hoists that are available in five rated capacities: 250, 300, 500 600 and 1000 pounds (113, 136, 226, 272 and 453 kg.). Each unit is supplied with a pendant throttle control station for controlling the lifting and lowering speeds and an upper latch type hook for suspending the hoist from a fixed support or trolley.
INSTALLATION UNPACKING After opening the carton, carefully inspect the hoist frame, control tube, hooks and pendant throttle control for damage that may have occurred during shipment. If there is damage, refer to the packing slip envelope. The recommended operating air pressure for the hoist is 90 psig. When line pressure exceeds 100 psig (at the hoist when it is lifting rated load), it is recommended that a pressure regulator be provided in the air supply line to keep the pressure at 90 psig.
1. When preparing to lift a load, be sure the attachments to the lower hook are firmly seated in the hook saddle. * Manual * Slow Blow Fuses Disconnect Inverse Time Avoid off center loading of anyor kind, especially loading Switch Circuit Breakers the tip of the hook or latch. Black Hoist Power Cord clear the 2. When lifting, raise the load only enough to White floor or support and check to be sure that the Ground attachments are firmly seated.
e. External evidence of excessive wear of brake parts see page 7. f. Check the control station levers to make sure they operate freely and spring back when released. g. Check air supply hose and control hose for kinks, cuts, leaks and damage. h. Check the chain pin or dead end pin and chain stop for wear and cracks. i. Check for lubricant leaks at gasket between main frame and gear housing. Tighten gear housing screws to stop leak. If leak persists, replace gasket. j.
Note that worn chain can be an indication of worn hoist components. For this reason, the hoist’s chain guide, hook block and liftwheel should be examined for wear and replaced as necessary when replacing worn chain. Also, these chains are specially heat treated and hardened and should never be repaired. Gears The Protector™ (620-111) should operate for the normal life of the hoist without service. The device has been lubricated and calibrated by CM® and should not be adjusted.
BRAKE The brake is non-adjustable with a nominal 0.004 inch (0.012 mm) air gap and the brake disc must be replaced when the gap reaches 0.012 inches (0.305 mm). The brake spacer should be no more than 0.012 inches (0.305 mm) thicker than the combined thickness of the brake disc and armature plate. Failure to follow proper lockout/tagout procedures may present the danger of injury from the escape of high pressure air.
DISASSEMBLY-ASSEMBLY 9. When disassembling and assembling the ShopAir Hoist, refer to the exploded view and the parts list on pages 10 thru 14. These show the proper relationship of the parts, the names of the parts and the required quantities of the parts. In addition, please observe the following: ! WARNING Components such as motors, valves, lines, filter/lubricators located after a closed shutoff valve can contain pressurized air. Disassembly in this state can cause injury.
5. On the 250, 300 and 500# (Single Reeved) (113, 136 and 226 kg.) units, remove the hook block from the old chain and attach it to the new chain by reusing the chain pin (620-158). On the 500, 600 and 1000# (226, 272 and 453 kg.) units: • Remove dead end plate (620-160) from hoist. • Remove dead end pin (620-161) from the last link of chain and pull chain out of dead end plate. • • • • • • Pull old chain out of hook block and disassemble the hook block.
SHOPAIR MECHANICAL PARTS EXPLODED VIEW 110
SHOPAIR PARTS LIST Key No. 620-107 620-108 620-109 Description Main Frame Liftwheel Seal Protector Bearing, Main Frame Side Protector Assembly 500# (Single Reeved) & 1000# Units Qty.
SHOPAIR PARTS LIST Key No. Description 620-103 Rotor Bearing, Inboard 620-116 Brake Base Plate 12 Qty. 1 1 620-117 Brake Disc 1 620-118 Armature Plate 620-123 Brake Spring 620-124 Brake Screw Capacity Plate 250# 300# 620-169 500# 600# 1000# 620-183 Hole Plug 620-184 Hole Plug 620-193 Brake Spacer 620-501 ShopAir Label 620-502 Motor Cover, Orange 620-503 Cylinder Cap 620-504 Motor Cover Screw (1.75” Lg.) 620-505 Motor Cover Screw (3.50” Lg.) 620-506 Motor Cover Screw (5.75” Lg.
*SEE PAGE 16 FOR EXPLODED VIEW OF MOTOR SHOPAIR EXPLODED VIEW AIR HOIST PARTS 620-543 620-555 620-543 620-556 620-554 620-552 620-553 620-557 620-559 620-558 620-550 620-551 SHOPAIR AIR CHAIN HOIST PENDANT THROTTLE CONTROL EXPLODED VIEW 13 14
TROUBLESHOOTING TROUBLE 1. Hoist does not operate. PROBABLE CAUSE a. Insufficient air pressure at source. b. Insufficient air supply at hoist. c. Clogged air intake or muffler. d. Excessive overload. e. Clogged valve block. f. Clogged pendant throttle control. g. Motor failure. h. Lack of lubrication. i. Brake not operating. REMEDY a. Check and adjust air pressure. b. Use correct size air supply hose (see page 3). c. Shut off air supply, disconnect air supply hose and clean air filter and muffler. d.
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