Thomas built the T-103 and T-133 skid steer loaders with different front and rear hydrostatic pumps, and this 81-page Thomas T-133, T-103 parts catalog PDF (OEM ID 025180-1) settles which part belongs on which machine by factory number. Hydraulics take the largest share of the book, with exploded views breaking down the boom lift and bucket tilt circuits, auxiliary gear pump, control valve, and lift and tilt cylinders, every callout tied to a part number and quantity. Your chain case axles, chain tightener, Quick-Tach plate and control levers get the same treatment, and hydraulic schematics plus wiring diagrams let you trace a circuit before you order. At the control valve, quote 26062 for the red boom detent spool and 18760 for the blue auxiliary spool. A guessed part number costs a week of downtime. Bookmarks jump between systems on screen, and any page prints for the bench, where grease won't matter.
What's Inside This Thomas T-133, T-103 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Main Frame | 1-15 | Fuel System, Rear Door and Latch, Quick-Tach Assembly, Shields, Seat and Belt, Decals and Paint, Wheel Equipment, Boom Lock |
| Controls | 16-26 | Control Levers and Neutral Centering Device, Foot Pedals, With Lock, Throttle and Diesel Stop Control, Parking Brake, Seat Bar and Neutral Centering Device |
| Final Drive Transmission | 27-31 | Axle Assembly, Chain Tightener Assembly |
| Hydraulic System | 32-52 | Oil Reservoir, Boom Lift Circuit, Bucket Tilt Circuit, Auxiliary Hydraulic Circuit, Auxiliary Gear Pump, Control Valve, Lift Cylinder, Optional Lift Cylinder |
| Hydrostatic Drive System | 53-67 | Hydrostatic Drive Circuit, Front Hydrostatic Pump, T103, T133, Rear Hydrostatic Pump |
| Electrical System | 68-70 | R.O.P.S. Harness, Engine Harness, Alternator, Starter, Battery, Fuel Gauge |
| Engine Equipment | 71-81 | Exhaust System, Air Cleaner, Universal Joint |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Auxiliary Gear Pump Cap Screw Torque | 25-28 ft. lbs. (34-38 N.M) | p. 46 |
| Detent Spool, Boom Red Torque | 2-3 ft. lbs. | p. 48 |
| Aux. Spool, Blue Torque | 2-3 ft. lbs. | p. 48 |
| Control Valve Detent Spool Torque | 2-3 ft. lbs. | p. 48 |
| Control Valve Aux. Spool Torque | 2-3 ft. lbs. | p. 48 |
| Control Valve Screw w/Lockwasher Torque | 2-3 ft. lbs. | p. 48 |
| Hydrostatic Pump Relief Valve Pressure | 3750 PSI (285.5 Bar) | p. 61 |
| Hydrostatic Pump Bolt Torque | 55-60 ft. lbs. (75-81 N.M.) | p. 65 |
Thomas T-133, T-103 Common Problems This Manual Covers
Thomas T-133 final drive axle assembly needs new bearings and seals, can't identify the right part numbers
Check the Axle Assembly exploded view on page 28 and match the axle shaft, bearings, seals, sprockets and wheel studs to their callout numbers. Read each part number from the list beside the drawing. Confirm whether the machine is a T-103 or T-133 before you order, since this book covers both models.
Manual Section: Axle Assembly p. 28Loose final drive chain, need the chain tightener idler support and sprocket part numbers
Open the Chain Tightener Assembly exploded view on page 30 and match the idler support, sprockets, chains and tensioning hardware to their callout numbers. Order the tensioning hardware as a set from that list. If the axle sprockets are worn too, cross-check them against the Axle Assembly drawing on page 28 before placing the order.
Manual Section: Chain Tightener Assembly p. 30Loader control valve boom spool needs replacing, need the correct detent spool part number
Check the Control Valve parts list on page 48. The boom detent spool (red) is part #26062 and the auxiliary spool (blue) is part #18760. Both torque to 2-3 ft. lbs. on reassembly. The screw with lockwasher is part #18764, also 2-3 ft. lbs., so order it with the spool.
Manual Section: Control Valve p. 48Boom lift circuit hydraulic hose blew, need the right hose and pipe part numbers
Check the Boom Lift Circuit exploded view starting on page 35. It shows the lift cylinders, hydraulic hoses, pipes and control valve connections. Match the failed hose by its callout and routing, then continue through page 37 for the rest of the circuit. Use the Oil Reservoir drawing on page 33 if the suction filter or filler cap also needs replacing.
Manual Section: Boom Lift Circuit p. 35Hydrostatic pump relief valve needs replacing, need the correct part number and pressure rating
Check the T-133 hydrostatic pump parts list on page 61. The relief valve is listed as part #22638, rated 3750 PSI (285.5 Bar). The T-103 pumps have their own pages in the Hydrostatic Drive System section, so confirm your model and whether it is the front or rear pump before ordering.
Manual Section: Hydrostatic Drive System p. 61Quick-Tach locking pins worn, need part numbers for pins, linkage and handle
Check the Quick-Tach Assembly exploded view on page 12 and match the locking pins, linkage, stabilizer bars and handle to their callout numbers. Read each part number from the list on that page. When you order new pins, check the linkage parts that drive them too, so the quick-attach plate locks the same on both sides.
Manual Section: Quick-Tach Assembly p. 12Frequently Asked Questions
What are the torque specs for the auxiliary gear pump cap screws on a Thomas T-133, T-103?
The cap screws for the auxiliary gear pump on both the T103 and T133 models should be torqued to 25-28 ft. lbs. (34-38 N.M.). p. 46
What is the torque specification for the hydrostatic pump bolts on the Thomas T-133, T-103?
The bolts for the hydrostatic pump on the T103 and T133 models should be torqued to 27-31 ft. lbs. (37-42 N.M.). p. 61
What is the relief valve pressure setting for the hydrostatic pump on the Thomas T-133, T-103?
The relief valve for the hydrostatic pump on the T103 and T133 models is set to 3750 PSI (285.5 Bar). p. 61
What is the correct battery specification for the Thomas T-133, T-103 skid steer loader?
The electrical system requires a 12-volt battery with a rating of 85 Amp. Hr. p. 70
Do I get instant access to this Thomas T-133 Parts Catalog?
A 81-page Parts Catalog in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print specific sections of this Thomas T-133 Parts Catalog?
Yes, printing is unrestricted: a single page, a chapter, or the lot, on letter or A4.
Is there a hydraulic diagram in this Thomas T-133 Parts Catalog?
Yes. The manual includes a hydraulic system diagram covering the main circuits. Page 35 carries one of them.
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