Thwaites Gearbox Main Shaft Newage 85M - OEM Number: T52346

The Thwaites Gearbox Main Shaft (Newage 85M) (OEM T52346) is a direct replacement transmission drive component used within Newage 85M gearbox assemblies fitted to a range of Thwaites site dumpers. It forms a critical part of the gearbox drivetrain, transmitting engine power through the gear train while supporting multiple gear engagement stages under load.

Manufactured to OEM specifications, this main shaft is engineered for high torsional strength, dimensional accuracy, and durability under continuous heavy-duty operation. It is designed to withstand the combined effects of torque, shock loading, and rotational stress typical of construction site dumper applications, ensuring reliable gearbox performance and smooth power delivery.

FUNCTION AND OPERATION

• Transmits engine power through the gearbox gear train
• Provides the primary rotational backbone of the transmission assembly
• Supports gear engagement across forward and reverse ratios
• Maintains correct alignment of gears and bearing surfaces
• Designed for high torque and shock-loaded operating conditions

TECHNICAL DETAILS

• OEM Part Number: T52346
• Type: Gearbox main shaft / transmission output shaft assembly
• Length: 189 mm
• Long Gear: 117 x 30 mm
• Short Gear: 34.5 x 49 mm
• Spiggot: 38 x 20 mm
• Function: Primary power transmission shaft within gearbox
• Application: Newage 85M gearbox (Thwaites site dumpers)
• Construction: Hardened alloy steel shaft with precision-machined gear seating surfaces
• Design: OEM-specified tolerances for direct replacement fitment in 85M transmission systems

TYPICAL APPLICATIONS

Suitable for a range of equipment fitted with Newage 85M gearboxes, including:

• Thwaites 3-tonne site dumpers (straight tip and swivel skip variants)
• Benford / Terex / Mecalac dumper platforms with 85M transmission
• Construction and earthmoving machinery driveline systems
• Industrial off-highway transmission assemblies

IMPORTANT INFORMATION

Always confirm the correct OEM part number, gearbox variant, and machine serial number before ordering, as main shaft specifications can vary between Newage gearbox revisions and related 40M/85M derivatives. Incorrect fitment may result in gear misalignment, abnormal noise, premature bearing wear, or complete gearbox failure under load.

DELIVERY OPTIONS (UK mainland only)

Next Day Delivery*
£11.95 or FREE for orders over £150
Orders placed before 4pm Monday to Friday will be delivered on the next business day.
Orders placed after 4pm on Friday will be delivered the following Tuesday.
*Next day delivery applies to stocked items only. Availability can be found on the product pages.

Premium Delivery*
£27.50 for delivery before 10:30am
£20.00 for delivery before 12:30pm
*Premium delivery applies to stocked items only. Availability can be found on the product pages.

For all other countries, please click here for full delivery information.

**Separate carriage charges apply to bulk products such as 205L barrels.