Multiquip 12859 Gearbox Spacer Plate

The Multiquip 12859 is a genuine OEM Gearbox Spacer Plate designed for Whiteman and International heavy-duty ride-on power trowel models including HHN31V, HHN34TVD, HHNG5, and EHHNK5. As a direct Multiquip OEM part, 12859 is manufactured to the exact tolerances required for proper gearbox assembly in these 8-foot mechanical ride-on trowel units. Sourcing the correct spacer plate matters — even minor dimensional deviation in the gearbox stack-up can affect blade pitch consistency and accelerate wear on surrounding drivetrain components. DHS Equipment supplies this part as an authorized Multiquip OEM replacement so you can restore your trowel to proper operating condition with confidence.

Key Features

• OEM-Exact Dimensional Tolerancing — Manufactured to Multiquip's original specifications, ensuring correct axial spacing within the gearbox assembly rather than an approximate fit.
• Drop-In Gearbox Compatibility — Installs directly into the gearbox stack on HHN-series trowels with no re-machining or shimming required during reassembly.
• Broad HHN-Series Fitment — Confirmed for HHN31V, HHN34TVD, HHNG5, and EHHNK5 Whiteman and International ride-on power trowels.
• Drivetrain Integrity — A correctly seated spacer plate maintains proper gear mesh and load distribution inside the gearbox, preventing premature wear on gears and bearings.
• Genuine Multiquip OEM Part — Supplied under part number 12859 directly through the Multiquip parts network, so you get the same component that left the factory originally.

The gearbox spacer plate is a precision component within the ride-on trowel's gearbox assembly that maintains the correct axial distance between internal gears and rotating elements. By holding each component in its intended position, the spacer plate ensures consistent gear mesh, even load transfer, and proper lubrication distribution throughout the gearbox. When this plate is worn, cracked, or dimensionally incorrect, it can cause gear misalignment, excessive backlash, and accelerated wear that quickly spreads to adjacent gearbox components — making timely replacement with the correct OEM part essential to keeping the trowel performing smoothly on the slab.

For questions about fitment or to confirm this part is correct for your specific machine, contact the DHS Equipment parts team before ordering.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

Why Buy From DHS Equipment

Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.