Description

Thomas 135, 137, 153 Parts Catalog

You’ve got a Thomas 135, 137, or 153 skid steer in the shop. You need a seal for the boom lift cylinder or a pivot pin for the lift arm. The aftermarket parts book gives you a drawing that’s close but not exact. You order it, it doesn’t fit, and now you’re down a day. This is the factory Thomas 135, 137, 153 Parts Catalog. 133 pages of OEM part numbers, exploded isometric views, and serial number splits that tell you exactly which revision you need. Eliminate guesswork.

Aftermarket approximations cost you time.

Fuel System Section: What’s on Page 1.1

Fuel system components are listed in section 1.1 of the Mainframe chapter. You get the fuel tank, lines, and filter part numbers with the exact OEM callouts. If you’ve ever ordered a fuel filter that didn’t match the mounting bracket, you’ll appreciate the factory drawings that show the bracket orientation and hose routing.

3 Serial Number Splits: Why the Manual Shows Two Versions

For some components, the manual lists two separate pages depending on your machine’s serial number range. For example, the Rear Door and Latch section has page 1.2 for machines up to S/N LN004999 and page 1.3 for S/N LN005000 onward. The Hydraulic Oil Filter also splits at LN004999. Use your loader’s serial number to pick the right page. Ordering the wrong part because you used a one-size-fits-all aftermarket diagram is a waste of money.

Hydraulic System: Boom Lift and Bucket Tilt Circuits

The hydraulic system chapter (section 4) covers the boom lift circuit, bucket tilt circuit, and auxiliary circuits with accumulator. If your machine has a self-level valve, use the dedicated spreadsheets on pages 4.3 and 4.5. The control valve, lift cylinder, and tilt cylinder are listed individually with seal kit part numbers. No composite drawing that leaves out the O-ring sizes.

Final Drive Transmission: Axle and Chain Tightener

Section 3 covers the transmission housing, axle assembly, and chain tightener assembly. If you need part numbers for sprockets, bearings, or chains, that’s where you look. The axle assembly diagram separates the left and right sides. No generic cross-section that lumps both together.

Controls and Restraint Bar: What’s in Section 2

Control levers, foot pedals, throttle, and the restraint bar are all listed with individual part numbers. The restraint bar is a safety-critical item – use the OEM part from this catalog to ensure proper fit and function. Aftermarket substitute brackets can interfere with the control levers.

Does This Catalog Cover the Engine?

This is a parts catalog, not a service manual. The engine equipment section (section 7) lists air cleaner, exhaust, and mounting parts. It does not include internal engine components like pistons or rings—those would be in a separate engine parts manual. If you need the overhaul specs, get the Thomas 135 137 153 1300 ProTough 2004 Repair Manual. For theory on how an Internal Combustion Engine works, that’s outside the scope of this catalog.

133 Pages of Real OEM Data

Every page is scanned from the original factory publication number 53296. You’re not looking at a re-drawn generic. The wiring diagrams in section 6 show the ROPS harness and engine harness with connector pinouts. On later loaders, these circuits communicate over a CAN Bus Network — the manual includes the correct wire colors and splice locations. For other Thomas loader models, check the Thomas T-233 HD, T-203 HD, T-183 HD, T-173 Parts Catalog – OEM Parts Manual and Thomas 173 HLS II 1996 Parts Catalog – Factory OEM Manual.

FAQ

Does this manual cover engine repair?

No. This is a parts catalog, not a service manual.

Will this work for my Thomas 153 with serial number LN002500?

The catalog covers S/N LN002000 onward for the 153. Check the serial number splits in the Rear Door and Hydraulic Oil Filter sections – two versions exist. Use the correct page for your range.

What’s the page count?

133 pages of exploded diagrams and part numbers. Not a single generic drawing – all OEM.

How do I find the right part for the boom lift circuit?

Go to section 4.2 for Boom Lift Circuit. If your machine has self-level valve, use section 4.3. The manual includes both variants with separate illustrations. Also note the auxiliary hydraulic circuit has a split at S/N LE011265 and LN004122 – you need to match your serial number exactly. Don’t guess. The wrong circuit diagram means the wrong part. That’s why aftermarket books fail – they combine everything into one vague drawing.

Stop chasing wrong part numbers. Get the factory breakdown. Access the Factory Manual from AutoRepairManuals and cross-reference every component against your machine’s serial number. That’s how you keep a Thomas loader running.