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Kelly Bar's Maintenance

Regular and effective maintenance can extend the service life of Kelly bars.

1. Maintenance Schedule
Working condition Interlocking type Friction type
First time use 50 100
Normal use Every 200 working hours Every 400 working hours
※Depending on the working hours of engine※
2. Maintenance Content
No. Part Damage condition Diagram
1 External drive key Edge curling, worn Diagram one: 1. 1-3mm edge curling; timely polish it

2. 5mm wear; weld the worn part using wear-resistant rod and overlaying method. After welding, rub down the joint to 90°. 3. Change the part if it is seriously worn.
2 Pressurizing block Wear Diagram two: Max. wear extent: 5mm;

Weld the worn part using wear-resistant rod and overlaying method. After welding, rub down the joint to 90°.

Change the part if it is seriously worn
3 External key, Kelly bar shell body Rupture Diagram three: 1. Use angle grinder to grind the ruptured part to 60°, with a V-shape groove; then use J506 welding rod to weld the groove and grind the joint. 2. Add three support plates around peripheral direction and weld them using splice joint welding method, ideally supporting the ruptured part
4 Drain pallet Wear Diagram four: Normal wear: weld it using bead welding method and grind

Serious wear: change the part
5 Spring Breakage Change
6 Bolt Damage Change
7 Upper damping ring Damage Change
8 Pin Damage Change
9 Joint Deformed with flaw Repair or change
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