spur. The gear shafts are supported with ball bearings housed in the back of the case and in the cover. The input helical pinion is cut directly into the motor shaft. An oil seal housed in the gear case at the motor input seals the motor shaft as it passes into the gear case. Since the entire motor shaft is submerged in oil, anytime the motor is removed, the oil must be drained from the gear case. All pinions are integral with their shafts while the gears are keyed and pressed onto their shafts. The output shaft passes through an oil seal in the back of the gear case and drives the drum by means of a crowned spline. One end of the rope drum is supported on this output shaft.
b)Inspection and Disassembly. Gearcase. (See Figure
(1)Lower hook block to the floor and relieve all load from ropes.
(2)Make sure power to hoist is off and locked out.
WARNING
Before disassembly, prevent rope drum from free spinning by wedging drum in place with a block of wood, and resting lower block on work surface so all weight is off rope drum. Rope may also be removed from hoist drum.
(3)Drain the oil from the gear case per Section IV, Paragraph
(4)Provide adequate means to support the gear case cover. Once the cover is supported, remove the two (2) shoulder bolts, seven (7) socket head cap screws, and nine (9) lock washers holding the cover to the gear case. Carefully draw the cover directly away from the gear case, as damage to this surface will prevent the gasket from sealing properly. As the cover is removed, ensure that all gear and shaft assemblies remain in the case.
WARNING
If output shaft assembly is pulled out of the gear case with the cover, it will disengage from the drum allowing the drum to drop. Be certain all shaft assemblies stay in the case.
(5)If it is necessary to remove the output shaft assembly from the gear case, the rope drum must first be removed from the hoist. See Section V, Paragraph
WARNING
The hoist must be removed from service and repaired on the ground for any maintenance that requires removal of the output shaft assembly or drum.
Only once the output shaft is free of the rope drum, can the output shaft assembly be safely removed from the gear case. Provide an adequate means to support this shaft and gear assembly before removing, as it weighs approximately 80 lbs. (“C” Frame Hoist).
(6)The pinion shaft and gear assemblies may be removed as necessary.
(7)Inspect all gears, pinions, bearings, and the output shaft spline for wear, pitting, or mechanical damage. Replace as necessary. See Section IX, Figure
(8)Assembly is opposite of removal. Use a new gasket. Do not attempt to assemble the cover to the gear case without a gasket, as the spacing between bearings will be reduced. Severe damage to the hoist will occur if no gasket or the wrong gasket is used. Refill gear case with new lubricant per Section IV, Paragraph
(9)Test hoist per Section V, Paragraph
Hoist Motor.
(1)Lower hook block to the floor and relieve all load from ropes.
(2)Make sure power to hoist is off and locked out.
(3)Drain the oil from the gear case per Section IV, Paragraph
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