GENMA Maintenance · Mechanical Structure | Slewing Ring Check: Smooth Rotation Starts Here

The slewing ring is the connection between the upper and lower parts of your GENMA machine — the upper carries the cab and boom, the lower is the undercarriage. It takes the machine's weight and lifting loads while allowing smooth rotation. Think of it as the machine's waist.

What to check daily

1. Lubrication

The slewing ring gear needs regular grease. GENMA manual says: apply grease every shift (8 hours) and check the gear mesh for debris. If your machine has an auto-lube system, it greases every 100 hours — but it's still a good idea to manually check if grease is coming out at the points.

2. Bolts

High-strength bolts connect the slewing ring to the undercarriage and upper structure. Check their torque every 50 hours. Loose bolts can cause play, increased shock loads, and eventually breakage.

3. Gear wear

Inspect the gear teeth for uneven or excessive wear. If wear looks uneven, measure the backlash using lead wire or soft material. If backlash exceeds 1.2mm or varies around the ring, contact your GENMA service engineer.

4. Anything unusual

Any odd noises, jerking, or visible play? Stop and investigate.

Service interval reminder

• Gear grease — every shift (or every 100 hours with auto-lube)

• Bolt torque — every 50 hours

• Gear oil change (slew gearbox) — every 1,000 hours or 1 year (first change at 150 hours)

The slewing ring takes heavy loads and shocks every day. Regular checks are not optional. Not sure about something? Reach out to your GENMA service engineer anytime.