Issued by the factory under document number 30232, this 230-page Thomas T103, T133, 207-133 repair manual PDF is the shop book for these skid-steer loaders. Hydrostatic drive work takes up the largest share of the pages, covering pump and torque motor testing, removal and rebuild, while the final drive chapter handles the drive chain and axle assembly inside your chain case. Hydraulic schematics trace oil from the gear pump through the control valve to the lift and bucket cylinders, and wiring diagrams map the starting system, instrumentation and circuit breaker. Set the system relief valve to 2150 PSI (148 BAR), plus or minus 50 PSI, then tighten its locknut to 16-20 ft. lbs. (22-27 N.M.). Some nights it's you, the loader, and nobody to ask. Bookmarked, text-searchable and bought once, this copy stays yours for as long as you keep the T103 or T133 running.
What's Inside This Thomas T103, T133 Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Serial Numbers | 3 | Model Number, Serial Number |
| Safety Precautions | 4-5 | Machine Guards, Lifting Appliances, Compressed Air, Hand Tools, Electricity, Solvents |
| Service Techniques | 6-7 | Hoses, Tubes, Bearings, Pressure Testing |
| Hydraulic System | 8-43 | Hydraulic Circuit (Specifications, Control Functions, Maintenance Schedule) |
| Hydrostatic Drive System | 44-102 | Hydrostatic Pumps, Torque Motors |
| Final Drive | 103-123 | Lubrication, Drive Chain, Axle Assembly |
| Controls | 124-158 | Steering, Foot Pedals |
| Electrical | 159-174 | Wiring, Instrumentation, Battery, Starting System, Circuit Breaker |
| Main Frame | 175-191 | Quick-Tach Assembly |
| Engine | 192-217 | Engine Removal, Cylinder Head, Cooling System, Lubricating System, Fuel System, Air Intake System |
| Maintenance and Specifications | 218-230 | Preventative Maintenance Schedule, 50 Hour Service Check, Loader Specifications, Torque Specifications, Decals |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Compressed Air Pressure | 100 PSI (6.9 BAR) | p. 4 |
| System relief valve pressure setting | 2150 PSI (148 BAR) ± 50 PSI (± 3.4 BAR) | p. 21 |
| Relief valve locknut torque | 16-20 ft. lbs. (22-27 N.M.) | p. 23 |
| Front pump to rear pump mounting bolts torque | 27-31 ft. lbs. (1.9-2.1 Bar) | p. 55 |
| Hydraulic gear pump mounting bolts torque | 27-31 ft. lbs. (36.6-42 N.M.) | p. 56 |
| Wheel nuts torque | 100-110 ft. lbs. (135-149 N.M.) | p. 102 |
| Chain tension (free play) | 1/4-3/8 inch (6.4-9.5 mm) | p. 105 |
| Chain tightener clamp nuts torque (T103/T133) | 100-110 ft. lbs. (135-149 N.M.) | p. 102 |
| Wheel nut torque | 100-110 ft. lbs. (135-149 N.M.) | p. 119 |
| Foot pedal shield stop clearance | 1 inch (25.4 mm) | p. 143 |
| Seat bar distance from top of ROPS | 5.75 in. (146 mm) | p. 146 |
| Starter Motor No-load test Current | 90 A or less | p. 161 |
Thomas T103, T133 Common Problems This Manual Covers
Thomas T103 T133 skid steer boom raises slowly with jerky action and loss of hydraulic power
Test the system relief valve pressure against 2150 PSI (148 BAR) ± 50 PSI (± 3.4 BAR) following page 21. If the reading is off, adjust the valve and tighten the locknut to 16-20 ft. lbs. (22-27 N.M.) per page 23. Then work through the leak down and overheating checks on page 41 before pulling components.
Manual Section: Hydraulic System Troubleshooting p. 41Hydrostatic drive loses power, runs erratic and noisy, or loader will not travel straight
Inspect the hydrostatic pumps and torque motors by working the drive troubleshooting chart, one symptom at a time. If the loader will not track straight, compare both drive sides before condemning a pump. Confirm pump displacement on page 45 so you order the right unit for a T103 versus a T133.
Manual Section: Hydrostatic Drive System TroubleshootingFinal drive chain case on one side turns noisy or loses drive completely
Check drive chain tension; free play should be 1/4-3/8 inch (6.4-9.5 mm) per page 105. Verify the final drive oil level; the housing holds 1.5 gal. (5.7 l) according to page 104. With no drive on one side, work the final drive chart on page 123 before tearing into the axle assembly.
Manual Section: Final Drive Troubleshooting p. 123Wheel studs keep shearing off or stripping threads at the wheel nuts
Torque the wheel nuts to 100-110 ft. lbs. (135-149 N.M.) following page 119 every time a wheel goes back on. Replace every sheared or stripped stud, then check the nuts on the remaining wheels against the same spec. Use the final drive chart on page 123 to run down why they failed.
Manual Section: Final Drive Troubleshooting p. 123Starter pinion engages but motor does not turn, or engine does not turn over
Remove the starter and run a no-load test: expect 90 A or less at 11.5 V with 3500 rpm or more, per page 161. Measure the brushes against the 0.5000 in. (12.7 mm) minimum and the commutator against the 1.1417 in. (29.0 mm) minimum on the same page. Replace anything under the limit.
Manual Section: Starting System TroubleshootingSeat bar fault: machine will not start and steering levers do not center
Verify the seat bar adjustment by measuring its distance from the top of the ROPS against 5.75 in. (146 mm) following page 146. Adjust it until it sits at that dimension, then retest starting and lever centering. If the levers still will not center, work the steering lever checks in the Controls section.
Manual Section: Controls p. 146Frequently Asked Questions
What are the torque specifications for the wheel nuts on the Thomas T103 and T133?
The wheel nuts for both the T103 and T133 models must be torqued to 100-110 ft. lbs. (135-149 N.M.). p. 104
What are the replacement specifications for hydraulic hoses on the Thomas T103, T133 skid-steer loader?
Hoses and tubes must be replaced if the end connections are damaged. Additionally, hoses should be replaced if they show signs of kinking, twisting, ballooning, or if the outer cover is chafed, which can lead to internal wire reinforcement corrosion. p. 6
What is the engine oil capacity for the Thomas T103 and T133?
The engine oil capacity for the T103 is 5.3 quarts (5 liters), and for the T133, it is 8.5 quarts (8 liters). p. 225
What is the correct valve clearance for the engine in the Thomas T103, T133 skid steer?
The valve clearance for both intake and exhaust valves, when cold, should be set between 0.0071 and 0.0087 inches (0.18 to 0.22 mm). p. 203
What is the torque specification for the cylinder head bolts on the Thomas T103, T133 skid steer?
The cylinder head bolts and nuts must be torqued to 54.2 to 57.9 ft. lbs. (73.5 to 78.4 N.M.). p. 202
What exactly do I receive with this Thomas T103 Repair Manual?
Straight to your device: 230 pages of searchable Repair Manual, downloadable the moment payment goes through.
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