Services & Support

We are committed to quality.

Having the right parts and the care of the experts can bring out the best performance of your unit.

Genuine Parts

We offer parts that are manufactured to the precise specifications of your unit. It is not cheap. But it is the only parts than can keep your equipment running the way it should be. And will keep it running longer.
  • Twin Disc designed splined parts to exacting tolerances. A part that doesn’t match our parameters won’t fit well. And it won’t last.
  • Twin Disc clutch plates are designed to use a specific friction material. The right combination of plate and material gives you the performance you expect. The wrong material can shorten component life.
  • Gaskets and seal that use cheaper materials become very expensive when you lose cooling and lubrication fluids through leaks.
  • Twin Disc products are designed to exact specifications with precise materials and heat requirements. Parts that don’t meet those specs can hurt performance.

For your parts requirement


From installation to emergency repair to general overhaul, JEFRA can customize your service requirement without sacrificing our service standards.

Excellence is our standard. Our expertise is your security.


An overhaul is a process where the unit is completely disassembled and all parts, including bearings and major parts are inspected, cleaned and/or replaced depending on its condition. On marine transmission, it is usually done after 5,000-10,000 running hours.

While our units are designed for heavy duty performance and with the proper maintenance it can withstand the test of time and even the most challenging operations, an overhaul is still necessary to extend the life of the unit thus maximizing its cost-effectiveness.


Marine transmission reconditioning involves almost the same process with overhauling but only involves wear-and-tear parts and to eliminate or minimize any vibration while unit is on operation. 

Alternator and motor reconditioning involves a thorough cleaning and inspection of the external and internal parts of the unit including all its wirings to ensure that insulation protections are still intact. 

The schedule of reconditioning primarily depends on outside factors like humidity and dust particles.

Trouble-shooting & Repair

Repair is the process of restoring the equipment to its proper running condition. It usually covers work done in an urgent manner like On-Board Emergency repair.


Rewinding is the process of removing and replacing coils that are shorted, grounded or otherwise damaged. Common reason for an alternator or motor to require rewinding is insulation failure like thermal deterioration caused by insulation overheats due to poor connection, excessive load demands or excessive reversals and starts.

Instrumentation Testing

Instrumentation testing is the process of gathering data on the unit in order to prevent any unexpected shutdown. Data gathered from this test shall be the basis whether an alternator or motor is already due for reconditioning or rewinding.

Installation, Commissioning & Testing

Commissioning after unit installation is the process of assuring all systems and components of the equipment are installed and tested in accordance with the established operational guidelines.

Testing is divided into 2 phases:

  1. Spin Testing Phase where the unit is coupled to an engine to ensure that it is in good running condition, that parameters are working and no leaking were encountered.
  2. Sea Trial is the final testing phase. It is conducted to measure a vessel’s performance and general seaworthiness, taking into consideration the vessel’s speed, maneuverability, equipment and safety features.

Preventive Maintenance

Preventive Maintenance is performed mainly for the following reasons:

  • To ensure that the equipment will operate under safe conditions and to prevent any harm for the machine and operators.
  • It conserves the lifespan of the equipment and assures optimal working condition.
  • To avoid any unexpected downtime that will result from the breakdown of the equipment.

When to schedule Preventive Maintenance?

  • Brand New – First 100 hours of operation and succeeding 1,000 hours of operation
  • Newly Overhauled / reconditioned – First 50 hours of operation and succeeding 1,000 hours of operation

Standard Preventive Maintenance Procedures:

Marine Transmission

  • Oil Level – must be done daily.
  • Lubrication – apply grease in the output oil seal every 100 Hours
  • Replace Filter – First 8 hours / Then Every 1000 Hours. Only use original and approved parts to maintain unit standard.
  • Change Oil – First 8 hours / Then Every 1000 Hours Use oil as prescribed in the Operator’s manual.
    Note: Multi-Viscosity Oil (i.e. 10w-20 etc.) should not be used in twin disc marine transmission.
  • Clean Strainer – First 8 hours / Then Every 1000 Hours
  • Check Heat Exchanger every 30 to 90 Days
  • Check / Inspect Flexible Coupling – First 100 Hours of Operation and every 2000 hours or every six months.
  • Oil Capacity – refer to standards indicated in the Operator’s Manual.

Power Take-Off

  • LUBRICATION – Use NLGI GRADE 2 GREASE with a minimum 149 °C, drop point for all lubrication.
    • Throw-out collar – 1cc EVERY 8 TO 10 HOURS
    • Main Shaft Bearing – add 1cc EVERY 8 TO 10 HOURS
    • Operating Shaft – 3 MONTHS/100 HOURS

Note: Sealed-for-life pilot bearing should not be lubricated during service, damage to engine crankshaft could result from trapped grease pressure.

    • NEW PTO should have clutch adjustment checked before being placed in Service. A newly placed in service PTO should have its clutch adjustment checked again after ten (10) hours of operation.
    • Do not adjust the clutch too tight. Forces above maximum can cause clutch component failure.
    • To insure there is no preload on the shifting mechanism, the hand lever position with the clutch engaged should past vertical position, slightly towards engine.


Standard wear-and-tear parts such as gaskets, oil seals, o ring, pistons rings, etc. are not covered by warranty.

Likewise, electrical replaceable parts such as Automatic Voltage Regulator (AVR), diodes, varistors, etc. are not warrantable.

For complete warranty information, click any of the following:

For more technical product information

We’d love to hear from you. Feel free to contact us.