38-Teeth 77×134.3mm Clutch Brake Friction Disc — Transmission Clutch Pack Plate

This 38-teeth, 77mm ID × 134.3mm OD friction disc is a wet-type clutch pack plate for the internal brake assembly within forklift powershift transmissions — specifically the smaller-dimension clutch packs found on 1-2 ton compact forklifts and electric warehouse trucks. The 38 internal spline teeth differentiate this plate from the 37-tooth variant used in larger 2-3.5 ton transmissions: the one-tooth difference is not a tolerance variation but a deliberate shaft hub design difference between transmission manufacturers. A 37-tooth plate will jam on a 38-tooth hub because the spline pitch circle diameter is different, not just the tooth count. The compact 77mm inner bore and 134.3mm outer diameter identify this as a plate for the smaller clutch pack assemblies used in light-duty transmissions where packaging constraints demand a more compact friction element than the 156.3mm plates used in medium-duty packs.

The friction material on this plate operates in a fundamentally different wear regime than the larger-diameter plates. Because the smaller OD provides less total friction surface area, the material is formulated with a higher graphite content for increased heat dissipation per unit area and a denser resin matrix for improved wear resistance under the higher unit pressures generated by the smaller piston area. The trade-off is that this higher-density compound is more sensitive to contaminated transmission fluid — degraded ATF with suspended metal particles will score these plates faster than the larger, lower-density plates because the particles cannot embed into the denser friction surface and instead act as abrasive slurry between the plate and the steel separator. This makes transmission fluid condition the single biggest factor in service life for these compact plates: a transmission running fluid 500 hours past its change interval will destroy a set of 38-tooth friction discs in a fraction of the time it would take to wear out the same material on a 156mm plate.

Compatible with Heli CPD10-CPD20, Hangcha CPD10-CPD20, Toyota 7FB10-7FB20 electric and compact diesel forklifts, and other 1-2 ton powershift transmission models using 38-tooth, 134.3mm OD internal clutch pack plates. Always count the spline teeth on your existing plate before ordering — 37, 38, and 41-tooth variants exist and are not interchangeable. Replace as a complete set within each clutch pack. Flush the transmission and replace both the internal filter and the external spin-on filter when servicing. Browse our transmission parts category. Reference OEM data at Heli official website.

Technical Specifications

• SKU: FRICTION-38T-134
• Key Differentiator: 38 Internal Teeth — compact 1-2T transmission plate. NOT compatible with 37-tooth (medium-duty) or 41-tooth variants. Verify spline count.
• Internal Splines: 38 Teeth
• Dimensions: 77mm ID × 134.3mm OD
• Friction Material: High-Density Wet Compound — Higher Graphite Content for Compact Pack Heat Dissipation
• Application: 1-2 Ton Electric & Compact Diesel Powershift Forklifts
• Warranty: 12 Months

Compatible Forklift Models

Kingstream friction discs are individually oil-paper wrapped, packed in rigid cartons. QC: tooth count verification, ID/OD measurement, material thickness check. 12-month warranty. Contact us for fitment verification or fleet pricing.