Twin Disc MG5090A Marine Transmission Parts for Canada - Overhaul Plate Kit Section

Overhaul Plate Kit Catalog (MG5090 · MG5090A)

This section gives you a clear, catalog-style path to the two essentials for servicing the Twin Disc MG5090A (and MG5090) clutch and sealing system: the Overhaul Plate Kit and the Gasket & Seal Kit. Each item below is presented the same way—what the part is, what it includes, and the signs you might need to change it—so you can validate the repair plan before opening the gear. Focus stays on the MG5090A platform; simply confirm your model, ratio, and tag details, then use the fitment and installation notes to select the correct kit and complete the job with confidence.

Overhaul Plate Kit — MG5090A 

What it is
A matched clutch plate pack engineered for the MG5090A’s forward and reverse clutches to restore designed torque capacity, consistent engagement, and stable operating temperatures.

What it includes

• Friction plates for forward and reverse clutch packs (MG5090A spec)
  
  

• Steel separator plates matched to MG5090A stack dimensions
  
  

• Pack arrangement designed to achieve the correct stack height for MG5090A builds
  
  

Signs you might need to replace

• Engine RPM rises without proportional vessel speed (slippage under throttle)
  
  

• Delayed, harsh, or chattering engagement when shifting into forward or reverse
  
  

• Burnt odor/darkened oil; friction debris present in filter or screen
  
  

• Proper line pressure observed, but hold is weak and oil temperature climbs quickly
  
  

• Visual inspection shows glazed frictions or blue/spotted steels
  
  

Fitment notes

• Confirm model (MG5090A vs. MG5090), reduction ratio, and serial/build data; internal clutch counts and stack heights can vary by configuration.
  
  

• If the transmission history includes overheating or contaminated oil, plan to pair the plate kit with fresh seals to protect hydraulic integrity.
  
  

Installation notes

• Pre-soak friction plates in approved marine transmission oil; maintain exact plate order/orientation during assembly.
  
  

• Measure and record stack height and pack clearances; compare to spec before closing the case.
  
  

• Inspect the clutch drum and hub splines; address galling or step wear to prevent rapid re-failure.
  
  

• After assembly, pressure-test forward and reverse at idle and increased RPM to verify apply pressures and engagement quality.
  
  

Gasket & Seal Kit — MG5090A

What it is
A complete sealing package for MG5090A service that replaces aged elastomers and static gaskets to stop leaks and maintain hydraulic efficiency after internal work.

What it includes

• Input/output shaft oil seals (as applicable to MG5090A build)
  
  

• O-rings and backup rings for control valves, pistons, and service plugs
  
  

• Cover and inspection plate gaskets
  
  

• Sealing washers as required by MG5090A configuration
  
  

Signs you might need to replace

• Oil seepage at shaft ends, inspection covers, or control housings
  
  

• Erratic/low apply pressures suggesting internal bypass or leakdown
  
  

• Any time the housing is opened for clutch service or internal inspection
  
  

• Evidence of water intrusion or emulsified oil (replace seals and identify source)
  
  

Fitment notes

• Designed for MG5090A; compatible MG5090 versions available—verify serial/build to match lip-seal dimensions and gasket profiles.
  
  

Installation notes

• Clean all sealing surfaces thoroughly; remove old gasket material without scratching.
  
  

• Lightly lubricate O-rings; protect lip seals when passing over splines/keyways (use guide sleeves where appropriate).
  
  

• Verify breather condition—restricted breathers can force oil past otherwise healthy seals.
  
  

Why Buy MG5090A Overhaul Parts from Diesel Pro Power

Product Matching & Verification

What it means for you
First-time-right kit selection. Provide your model, ratio, and serial/build data and we’ll confirm clutch pack arrangement and seal dimensions specific to MG5090A before fulfillment.

Marine-Grade Quality & Packaging

What it means for you
Friction and steel plates arrive flat, clean, and protected; seals are fresh and individually packed to prevent contamination—ready for bench work the moment you open the box.

Technician-Ready Catalog Format

What it means for you
Clear “what it is / what it includes / signs you might need it” structure helps validate your diagnosis quickly and minimize downtime on the dock or in the yard.

One-Stop Convenience

What it means for you
Pair the Overhaul Plate Kit with the Gasket & Seal Kit so you have everything needed to complete the MG5090A service without mid-job sourcing.

Experienced Support, Trusted by 40,000+ Customers

What it means for you
Have your tag details ready—our marine-focused team will help confirm stack targets, seal selections, and practical install notes so you can finish the job with confidence.