Printed by Carraro under document number CA270104, this 150-page Carraro 26.20M, TB172 repair manual PDF is the factory workshop book for the Mod. 26.20M+TB172 steering axle assembly. Disassembly and assembly work fills most of the book, covering the steering cylinder, epicyclic reduction gears, wheel hub, brake pack, differential support and pinion group, then toe-in and steering angle adjustment and a test after assembly. A troubleshooting section matches axle symptoms to their causes, and the special tools list shows the backlash and preload gauges you will want on the bench. Hold bevel gear backlash between 0.15 and 0.30 mm, and replace any brake separator plate worn below 4.9 mm. Setting pinion preload on a collapsible spacer is unforgiving work. The PDF is bookmarked and has a text layer, so it helps you rebuild the axle and get the machine steering, braking and driving again.
What's Inside This Carraro 26.20M, TB172 Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-12 | Manual Use, Information Property, Agreements and Definitions, Recommendations for Repair Operations |
| Safety Instructions | 13-17 | General Safety Recommendations, Safety Symbols, General Precautions |
| General Specifications | 18-35 | Intended Use, Product Identification, Technical Features, Maintenance and Oil Change, Grease in Assembly, Adhesives and Tightening Torques, Brakes Wear Check |
| Steering Cylinder Group | 41-49 | Steering Cylinder, Steering Sensor, Tie Rods, Ball Joints, Cylinder Head, Piston |
| Epicyclic Reduction Gear Group | 50-53 | Planetary Carrier, Planetary Gears, Needle Bearings, Thrust Washer, Seeger Rings, Oil Plug |
| Wheel Hub Group | 54-62 | Wheel Hub, Wheel Carrier, Epicyclic Ring Gear, Centering Bushes, Bearing Cones, Seal Ring |
| Axle Beam Trumpet Group | 63-67 | Axle Beam Trumpet, King Pin Bush, Ball Bearing Cup, Seal Rings, O-Ring |
| Brake Group | 68-82 | Brake Piston, Brake Disks, Counterplates, Self-Adjust Kit, Parking Brake Piston, Thrust Pin |
| Differential Support Group | 83-93 | Differential Housing, Adjuster Ring Nuts, Bearing Cups, Ring Nut Retainer, O-Ring |
| Differential Group | 94-102 | Differential Housing, Bevel Gear Crown, Differential Half Boxes, Bearing Cones, Sleeve, Pins |
| Pinion Group | 103-111 | Bevel Pinion, Bearing Cones, Bearing Cups, Collapsible Spacer, Ring Nut, Shims |
| Toe-In/Steering Angle | 112-116 | Toe-In Adjustment, Steering Angle Adjustment, Mechanical Steering Stop, Steering Rods, Lock Nuts |
| Special Repair Operations | 117-125 | Wheel and Double U-Joint Group Disassembly, Wheel and Double U-Joint Group Assembly, Double U-Joint Seal Ring Replacement, Double U-Joint Bushing Replacement |
| Testing After Assembly | 126-127 | Testing Methods, Gear Engagement, Wheel Rotation, Brake Regulation |
| Troubleshooting | 128-136 | Axle Problem and Diagnosis |
| Special Tools | 137-139 | Wrenches, Handles, Drivers, Piston Insertion Kit, Bearing Insertion Kit, Backlash Measurement Tool, Preloading Measurement Tool |
| Service Operations Time | 140-150 | Service Operations Time Schedule |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Bevel gear set backlash | 0.15÷0.30 mm | p. 22 |
| Pinion bearings rolling torque | 1.6÷2.4 Nm | p. 22 |
| Pinion bearings rolling torque (measured without seal) | 1.6-2.4 Nm | p. 22 |
| New separator plate thickness (brake) | 5.0±0.05 mm | p. 23 |
| Worn separator plate minimum thickness (brake) | 4.9 mm | p. 23 |
| Bearing dimension A | 08.450 - 08.500 mm | p. 63 |
| Bearing dimension B | 54.775 - 54.825 mm | p. 63 |
| Dry weight | 451 kg | p. 22 |
| Steering angle | 36° | p. 22 |
| Differential oil capacity | 10 liters | p. 25 |
| Epicyclic reduction gear oil capacity (each side) | 0.6 liters | p. 25 |
| Transfer box oil capacity | 1.3 liters | p. 25 |
Carraro 26.20M, TB172 Common Problems This Manual Covers
Carraro 26.20M TB172 axle brake friction plates and separator plates worn below minimum thickness
Disable the negative parking brakes before opening the brake group (page 71). Measure friction plates against the 4.08 mm wear limit (4.8 mm new) and separator plates against 4.9 mm (5.0 mm new), per page 23. When fitting new disks, push the brake piston back to its original position (page 80). Release press load slowly; belleville washers can eject rapidly (page 74).
Manual Section: Brake Group p. 23Axle steering cylinder, tie rods and ball joints showing steering difficulty when turning
Check the steering difficulty causes in the troubleshooting section on page 128 first. Remove the tie rods without damaging the threaded pin ends, check their condition, and replace nuts (1) and (16) if damaged (page 45). Fit new seals and O-rings on the cylinder head, piston and cylinder body, since removal destroys them (page 46). Torque ball joints to the requested value.
Manual Section: Steering Cylinder Group p. 44Differential bevel gear set and pinion bearings producing excessive noise while driving in gear
Check the noise symptoms against the diagnosis on page 128 before tearing down. When rebuilding the pinion group, measure pinion bearing rolling torque without the seal against 1.6 to 2.4 Nm, then set bevel gear set backlash to 0.15 to 0.30 mm (page 22). Do not invert the differential support bearing cups when reusing the bearings (page 87).
Manual Section: Pinion Group p. 103Transmission box shaft seal ring and differential support seal ring damaged on removal
Remove the oil pipe (13) and drain the oil before opening the box (page 37). Secure half box (6) to a hoist with an eyebolt in the plug (15) hole before removing screws (12) (page 38). Fit new seal ring (29) with CA715395 in the shown direction (page 40) and seal ring (9) with CA715038 (page 41). Refill the transfer box with 1.3 liters (page 25), axle horizontal (page 26).
Manual Section: Transmission box p. 37Double U-joint seal ring or bushing worn at the wheel and swivel housing
Remove the wheel and double U-joint group following page 117, taking care not to damage the double U-joint (page 57). Secure the swivel housing (14) to a hoist with a belt or rope before removing the king pins (page 59). Replace the seal ring and bushing, then wrap the axle shaft splines with tape to protect seal ring (24) on refit, removing all tape afterward (page 62).
Manual Section: Special Repair Operations p. 117Uneven tyre wear on the steering axle with toe-in out of adjustment
Check uneven tyre wear causes in the troubleshooting section on page 128, then loosen the steering rod lock nuts and adjust toe-in following page 112. Verify steering angle against 36° (page 22) and set the mechanical steering stop. Adjust the steering sensor only after toe-in is done, respecting its electrical specifications and connection scheme (page 49).
Manual Section: Toe-In/Steering Angle p. 112Frequently Asked Questions
What are the torque specifications for the Carraro 26.20M axle?
The torque specifications for the Carraro 26.20M axle vary by component. For example, the transmission box fastening bolts (7) are 75 Nm and (12) are 55 Nm, while the differential support bolts are 320 Nm. Detailed torque values for various components are provided in the diagrams on pages 33 and 34. p. 33
What are the oil seal replacement specifications for the Carraro 26.20M, TB172 axle assembly?
When replacing shaft seals, ensure the shaft is not damaged, cut, or out of round. Assemble the seals so the lip faces the oil side, lubricate the lips with oil, and fill 3/4 of the seal cavity with grease. Do not use a hammer directly on the seals; use appropriate drivers. p. 11
What is the oil capacity for the differential on the Carraro 26.20M axle?
The differential oil capacity for the Carraro 26.20M axle is 10 liters. Use only recommended oil enriched with additives, such as API GL4 or MIL-L-2105. p. 25
What is the procedure for checking brake wear on the Carraro 26.20M axle?
To check brake wear, actuate the service brake, remove the inspection plug (1), and attempt to insert a 4.08 mm diameter pin between the counterplates. If the pin does not fit, the brake discs are worn and must be replaced. If the pin fits, the discs do not need replacement. p. 35
What is the maximum operating pressure for the brake oil system on the Carraro 26.20M, TB172 axle?
The maximum operating pressure for the brake oil system is 44 bar. The operating temperature range for the brake oil is -40°C to 120°C. p. 25
How will I receive this Carraro 26.20M Repair Manual?
Delivery is instant: a 150-page searchable PDF is yours the second checkout clears. Laptop, tablet, or phone, all fine.
Is this Carraro 26.20M manual print-friendly?
Yes. Print a chapter or just the pages for the job at hand, for use in your own shop. Any home or office printer works.
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