Front suspension mounts – The Solution
Superbolt™ Solution of MJTs, Studs & Flexnuts first installed as active field test in December 2007
SUPERBOLT
Generator urbine Superbolt Tensioner
FLEX NUT
SUPERBOLT EZFIT
HYDRAULIC EXPANSION BOLTS
SUPERBOLT TOOL
MULTI-JACKBOLT TENSIONING
Superbolt multi-jackbolt tensioners (MJTs) take the high preload requirements in large diameter bolting and break it down into manageable torques using the jackbolts threaded through the nut body.
How it works
- By tightening the jackbolts, a strong thrust (axial) force is generated and directed against a hardened washer
- The loads are transferred through the nut body, which is positioned on the main thread by hand
- A hardened washer is used to transfer the force while protecting the flange face
- The thrust (axial) force of many jackbolts and the opposite reaction force of the main bolt head create a strong clamping force on the flange
- The thrust (axial) force from the jackbolt creates an equally strong reaction force in the main bolt
Advantages
- Tremendous clamping force available
- Low torque requirement – only hand tools needed
- Safe method for installation personnel
- Quick installation and removal
- Tightens stud/bolts using pure tension
- Tensioner flexibility adds elasticity to studs/bolts to create a better bolted joint
- Fits in restricted areas
- Provides even tension from stud to stud
- Accurate within 10% of specified bolt tension
Application
Caterpillar & Komatsu Mine Haul Truck Front Suspension bolt
Metalurgy industry
Gas and pipeline bolting
Suspension bolt
SOLUTIONS FOR HEAVY MINING EQUIPMENT
Nord-Lock give you LIFE TIME WARRANTY
Front suspension mounts
Factory bolting configuration for the front strut limits access for the technicians and proper tooling.
• Safety concerns working with high energy tooling in confined space.
• Lack of proper reaction point for conventional tooling meant tooling would often slip adding to the danger.
• The factory specified Torque/Turn to Yield tightening method, does not achieve adequate preload for the severe service conditions.
• Inadequate preload then results in factory bolts failing in yield or fracture.
• Bolt failures often result in damage to the mounting faces necessitating expensive field machining and downtime in order to repair fretting damage.