Zoomlion ZT20J, Service And Maintenance Manual

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4-11
b) Remove the oil drain plug and oil filler plug, drain the oil in the reducer, and drain the oil in the
brake.
1. Before injecting new oil, clean the inside of the rotary reducer and brake with cleaning fluid.
2. Inject the cleaning fluid into the rotary reducer and brake, install the oil filling plug, run at
high speed for several minutes, and then drain the cleaning fluid.
The use of aggressive cleaning agents or unsuitable lubricating products can change the
characteristics of oil esters, thereby causing damage to the trajectory and related parts.
4.11 Slewing Bearing
4.11.1 Slew bearing lubrication
Proper lubrication is necessary for the durability of the track and gear. The lubrication cycle is
determined according to the use situation and the environment. It is recommended to lubricate once
every 150 hours under normal circumstances.
When the equipment is not used for a long time, the slewing bearing should be lubricated, and the
lubrication frequency should be more frequent in tropical climates affected by temperature,
windy sand or humid areas.
a) Use a grease gun to inject Mobilux EP 2, Shell Alvania EP (LF) 2 grease from the grease nipple on
the slewing ring into the slewing ring until the grease leaks from the seal and fills the ring.
Lubricate the slewing bearing, generally add grease every 150 hours of work; if it is used in strict
dusty and humid environments, shorten it to 50 hours; if it is stopped for a long time, lubricate
every 6 months.
b) Lubricate the gear. The tooth surface should always be clear of debris and coated with
corresponding grease. Regardless of spraying or brushing, the grease must completely cover the
pinion and the toothed surface of the ring gear.
4.11.2 Check and maintenance
a) After the slewing bearing is operated for 100 hours, check the pre-tightening force of the bolt. If
there is any abnormality, tighten it in time, and the bolt tightening torque is not less than
520Nm/384ftlb. After every 500h of operation, it must be maintained with sufficient pretension.
Generally, the bolts must be replaced every 7 years or after 14000h of work.
b) In use, avoid direct exposure of the slewing bearing to direct sunlight, prohibit direct washing of
the slewing bearing with water, prevent water from entering the raceway, and prevent hard foreign