Henkel’s LOCTITE® range of Maintenance Repair adhesives provide a superior solution for the paper and board industry.  The harsh environment of the paper and board industry leads to a variety of maintenance challenges. LOCTITE Maintenance Repair Adhesives can help in eliminating the challenges and increase productivity of machinery. Industrial gearboxes play an important role in processing of paper and board products. Reliable operation over a long service life, with minimum maintenance, is a key requirement.  


Challenge 1: Gasket Failure Between Upper and Lower Housing of a Split Gearbox 

Oil leakage from failed gasket between upper and lower housings of split case gearbox can increase risk of gearbox running low on oil and increase overall oil consumption, safety hazards, and clean-up costs. 

Solution: Seal flanges with LOCTITE 518 Gasketing Compound 

LOCTITE 518 is a medium-strength, general purpose gasketing product with excellent contamination tolerance. Ideal for use on casted iron, steel, and aluminium flanges. 

LOCTITE® 518 cures when confined in the absence of air between close-fitting metal surfaces. It is an anaerobic gasketing material designed for use on rigid iron, aluminium, and steel flanged mating surfaces. LOCTITE 518 fills gaps up to 0.25mm and forms a flexible, chemical-resistant seal that will not tear or decay. Moreover, parts disassemble easily, even after extended service. Typical applications include sealing close-fitting joints between rigid metal faces and flanges. It is also used as a formed-in-place gasket on rigid flanged connections, e.g., transmissions and motor housings. 


Challenge 2: Loosening and Corrosion of Housing and Cover Fasteners 

Cover fasteners can loosen when exposed to torque, vibration, thermal expansion, and shock loads. Once the fasteners become loose, the preload on the gasket is lost and the gasket fails. Additionally, cover fasteners can corrode and seize making gearbox maintenance difficult and hence create additional labour associated with drilling and tapping of the fastener hole. 

Solution: Secure cover fasteners with LOCTITE 243 Threadlocker 

LOCTITE 243 is a medium strength blue threadlocking adhesive that seals and secures metal nuts and bolts to prevent loosening due to shock and vibration. 

LOCTITE® 243 is a general purpose threadlocker that provides a medium strength bond. It works on all metals, including passive substrates such as stainless steel, aluminium, and plated surfaces. It is proven to be tolerant of minor contamination due to industrial oils, e.g., motor oils, corrosion prevention oils and cutting fluid. 


Challenge 3: Shaft Mounted Components, Spun Bearings on Shaft 

Bearings are prone to spinning on the shaft due to dynamic load on the assembly which produces axial loads higher than the original calculations. This bearing spin leads to damage on both shaft and bearing which may necessitate component replacement, causing unplanned downtime and scrap costs. 

Solution 1: Fit bearings on shaft with LOCTITE 641 Retaining Compound (gap < 0.15mm) 

Solution 2: Fit bearings on shaft with LOCTITE 660 Retaining Compound (gap < 0.5 mm) 

Loctite 641 Retaining Compound – medium strength. If disassembly is required, it is ideal for parts that need subsequent dismantling. 

LOCTITE® 641 is designed for the bonding of cylindrical fitting parts, particularly where disassembly is required for servicing operations. The product cures when confined in the absence of air between close-fitting metal surfaces and prevents loosening and leakage due to shock and vibration. Ideal for parts that need subsequent dismantling, i.e., retention of bearings on shafts and in housings. 

LOCTITE 660 is a high strength retaining compound with good gap filling properties, ideal for repairing worn-out seats, keys, splines, bearings, or tapers without re-machining. 


Challenge 4: Loosening of Fitted Gears 

Gears are prone to loosening on the shaft under dynamic loads, leading to reduction in the transmitted torque. 

Solution: Fit gears on shaft with LOCTITE 638 Retaining Compound 

LOCTITE 638 is a high strength, fast curing, general purpose retaining compound. 

 The product offers high-temperature performance and good oil tolerance and tolerates minor surface contaminants. 

Henkel is a leading global supplier of adhesives, sealants, and surface treatments. With over 140 years of experience LOCTITE is committed to sustainability and innovation.  

Motion’s commitment to customer satisfaction and their extensive knowledge of industrial applications makes for the perfect partnership with Henkel’s adhesive solutions.

Benefits of LOCTITE® 638 retaining compound: 

  • High strength retaining adhesive.
  • Designed for holding bearings on shafts and other cylindrical parts.
  • Provides a strong and durable bond that can withstand heavy loads and vibration.
  • Can fill gaps up to 0.25 mm.
  • Cures at room temperature.
  • Requires no mixing.
  • Resistant to corrosion, chemicals, and temperature extremes.