Here is a write-up regarding the TMP gearbox top housing based on common service manual procedures for this unit.
: Find out the exact model or type of the gearbox you're working with.
Reassembling a TMP gearbox requires clean mating surfaces and new sealing components. The workshop manual advises replacing all internal soft components during any teardown. Essential Reassembly Components Input Oil Seal: TM 12020 Output Oil Seal: TM 12016 Direct Drive Gasket & O-Ring Kit: TM 12470 Neutral Brake Pad Replacement Shaft and Cover Alignment Steps diy.htm - Thamesway Marine Products
Before you turn a single bolt, heed the candid advice of the TMP community: . This gearbox is heavy (the 2-pinion version is 55 kgs). On many installations, the bellhousing carries the rear engine mounts, so you must support the engine when you remove it.
The workshop manual is primarily available through Thamesway Marine Products (TMP) , the official manufacturer and service provider for these units since 1982. Accessing the Manual & DIY Resources tmp gearbox workshop manual top
Understanding the physical limits and directional rules of your specific TMP model is critical before launching into a tear-down. This data establishes baseline operating conditions for the Type 12000 range. Specification Parameter Standard Requirement / Value TMP Type 12000 Series Approximate Base Weight ~55 kg (121 lbs) for full assembly Approved Lubricant Type SAE 30 Single-Grade Engine Oil (Avoid Multi-grade) Standard Engine Rotation Right-Hand Clockwise (facing front of engine) Alternative Engine Series Series ID starting with "21" (Left-Hand/Front Flywheel) Maximum Operational Hull Angle 15° to 17° relative to the waterline
is renowned for its durability and reliability in heavy-duty machinery, particularly in marine, industrial, and agricultural applications. Whether you are performing routine maintenance, troubleshooting a complex issue, or conducting a full rebuild, having the correct technical information is essential.
Official workshop manuals and specialized repair advice are still maintained by the successor company, Thamesway Marine Products
If your assembly features a splined input connection, it should slide loose smoothly. Here is a write-up regarding the TMP gearbox
If the official route is not enough, the community of TMP owners is your next best friend. These forums are where real-world fixes and shared knowledge reside. Key threads include a post on DIY repairs which says the gearbox is "heavy and awkward to handle"; a forum user saying Thamesway Marine Products "still stock full range of spares" and that they have "a full set of cutaway diagrams with part numbers"; an owner who notes a noise only evident at higher revs and that bearings are "standard taper rollers," implying rebuilding might be "fairly straightforward"; a request for a copy of a manual that reveals a user had to go to a workshop that "is a cowshed at the bottom of his garden" to get parts; and identification help where a user confirms a gearbox "looks like a TMP (Tideway Marine Products) hydraulic gearbox" and shares a warning that "you should not use copper based alloys (like brass) for cooling connections".
Before beginning any service work, look at the identification plate on the back or top of the housing. The dictate your exact internal oil pump configuration and internal rotation direction.
When disassembling, label every part to ensure it goes back into its original position.
This is further confirmed by official specs which clearly list separate checking and filling procedures for the "Main Gearbox" and the "Reduction Gearbox". The workshop manual advises replacing all internal soft
Without a specific model or more details about the "tmp gearbox," it's challenging to provide targeted information. If "tmp" refers to a specific model, brand, or type of gearbox, incorporating that detail into your search query could yield more precise results.
Experts and owners often emphasize the difficulty of separation and the precision needed for internal components like the hydraulic pump and clutch linings.
Remove gearbox from engine flywheel to replace seal TM 12090. Incorrect propeller hand pitch installed.
When it comes to heavy-duty industrial transmissions, few names command as much respect in the field as . Known for their robust engineering and high torque tolerance, TMP gearboxes are the backbone of countless conveyor systems, agricultural machines, and automotive lifts. However, even the most durable machinery requires meticulous maintenance.