Jingya provides worm gear speed reducers for geared traction elevators used on construction sites. Worm wheels are chrome plated circular disks. Minimized power loss, high load bearing capacity, low oil temperature, excellent scuffing resistance, steady running, minimal vibration, low noise and long service life are major benefits of our worm gear speed reducer compared to competitive products.

1. Gear precision grade reaches 7-7-6b. Worm shaft is of carburized steel that receives quench hardening treatment to achieve HRC56-62 hardness.
2. Worm wheel is EQSN12-2 nickel tin bronze. High-strength 201 aluminum alloy castings are used for the body which also receives heat treatments.
3. Bearings come from the USA. Oil seals are imported from Germany.
4. In addition to worm gear speed reducers, Jingya also offers spiral bevel gear reducers. Available with case hardened teeth, the spiral bevel gear set is a two-stage gear train offering more than one reduction ratio.
5. For medium and low-speed construction hoists, the worm gear speed reducer is the best bet. When it comes to high-speed, heavy duty construction hoists, the bevel gear set is the ideal way to go, due to its high efficiency, torque, temperature increase and ease of maintenance.

Frequently Asked Questions
1. What are the benefits of cylindrical worm gear set over ordinary worm gear drive?
The unique worm profiles facilitate the formation of oil film at the contact surface of the gear teeth. The lubricating oil is able to maintain a low temperature and has excellent anti-scuffing capacity.

2. What is the ideal working temperature for a worm gear speed reducer?What is the temperature when operating at full load?
Jingya worm gear set can work properly at temperatures anywhere from -40°C to 40°C. When operating at full load, the gear set temperature should not exceed 100°C.

3. What kind of gear lubricant should I use?
N320 worm gear lubricant is the best. (Or Mobil SHC634 synthetic gear lubricant.)

4. How often should I replace lubricating oil for the worm gear speed reducer?
During the first-time use, change in new lubricating oil after 7 to 14 days, suppose the worm gear speed reducer works no more than 8 hours every day. After that, replace the lubricant every 10 months. Change lubricating oil every month if your speed reducer is expected to work non-stop for a long time.

5. What are the benefits of your spiral bevel gear speed reducer over worm gear reducer?
Main benefits include higher power transmission efficiency, larger torque, lower temperature increase, easier maintenance, greater design simplicity, and minimized operation noise. The spiral bevel gear set is a double-stage gear train that uses bevel gears in the first stage and helical gears as the second-stage. This gear configuration is suitable for use on high-speed, heavy load construction elevators.

6. Can I see the specification comparison between the two types of speed reducers?
Please refer to the table below.

It is highly recommended that oversea customers should buy extra worm gear reducers during their first-time purchase. Jingya does not provide replacement, technical training, and on-site instruction services for customers outside China. Flexible shaft couplings need to be used for a reliable connection between the input shaft of the gear reducer and the output shaft of the motor. Do not use hammer to strike any part during installation. We also advise customers to buy extra worm shafts and worm wheels.

Installation and Use
1. Flexible shaft couplings are required to connect between the gear reducer's input shaft and the motor's output shaft. Do not use hammer to strike any part during installation.
2. Shaft alignment tolerance should meet the required value of the shaft coupling.
3. Gear reducer must be fixed to a stationary base plate. Do not start the construction hoist without getting the gear assembly commissioned first. Failure to do so may lead to severe damages to the entire speed reducer assembly, oil seal, bearing and other parts.
4. The installed gear reducer must be rotated freely by hand. Check the gear reducer for jamming before giving it a no-load test run. After confirming that the drive operates properly, gradually add load to the motor at 25%, 50%, and 100% capacity.
5. Each loaded test run should last no less than 2 hours, with the maximum temperature not exceeding 100°C. Check the speed reducer for vibration, noise, and leakage at seals and joints during the test.
6. Check the gear reducer regularly for any scratches, scuffs, or wear. Once any of these problems were found, take necessary measures to solve it immediately. Problem bearings and oil seals need to be replaced right away. All replacement parts should meet high quality standards.

How to lubricate a speed reducer?
1. Gear parts are immersed in N320 lubricating oil. When the ambient temperature drops below 0°C, use low-viscosity lube oil. If oil level is low, fill oil to the gearbox through the filler plug until it comes out the oil level plug.
2. During the first-time use, lubricant needs to be changed every 100 hours of operation. After that, check of lubricant quality frequently. Remove impurities or degraded lubricating oil in time. Normally speaking, lubricating oil needs to be replaced every 6 to 8 months, if the operation will be continuous for long. Change oil every 10 months if the operation will be intermittent and last no more than 8 hours per day.
3. Lubricating oils are identified by viscosity grades and number symbols which consist of an English letter followed by three digits, such as symbol N320. Do not mix different number symbols or viscosities of oils. During oil change, the worm gear needs to be heated and cleaned using lubricant of the same number symbol.
4. If oil temperature were found to have exceeded 100°C or abnormal noise occurred, stop the gear reducer immediately for troubleshooting. The gear reducer needs to be cleaned thoroughly once in a year. Unless parts are damaged, do not dismantle, repair or alter the gear reducer. If parts damage or gear teeth engagement problems were found, please contact us as soon as possible.