Axle problems and diagnosis get a dedicated chapter in this Carraro 20.26 repair manual PDF, a 135-page factory book (OEM ID CA357357) for the 20.26 front axle and its FR version. Disassembly and assembly run group by group: flange, sensor, steering cylinder, epicyclic reduction gear, brake, wheel hub, axle beam, differential support, the ML and LS differentials and the pinion, ending with toe-in, steering angle and testing after assembly. Oil change and checks, grease, adhesive and sealant guidance sits next to the tightening torque table, and a special tools list plus a service operations time schedule complete the book. Set bevel gear backlash at 0.15-0.20 mm and torque the pinion shaft flange nut to 460 Nm. Rebuilding the wheel hub? Your bearing dimension A has to fall between 23.150 and 23.250 mm. Bookmarks drop you on the exact group you are working on, and the text layer lets you search any part name in seconds.
What's Inside This Carraro 20.26, 20.26 FR Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-11 | Manual Use, Information Property, Agreements and Definitions, Recommendations for Repair Operations |
| Safety Instructions | 12-16 | General Safety Recommendations, Safety Symbols, General Precautions |
| General Specifications | 17-36 | Intended Use, Product Identification, Technical Features, Oil Change and Checks, Grease in Assembly, Adhesive and Sealant, Tightening Torque |
| Flange Group | 37-39 | Lock Ring, Pinion Shaft, Flange, Seal Ring, Differential Support |
| Sensor Group | 40-48 | Greaser, Special Screw, Washer, Sensor Pin, Swivel Housing, Sensor Cover, Rubber Bush, Electrical Wires |
| Steering Cylinder Group | 49-54 | Pipe Fittings, Steering Cylinder Heads, Tie Rod Locknut, Steering Arm, Tie Rods, Cylinder Rod, Ball Joints |
| Epicyclic Reduction Gear Group | 55-58 | Planetary Carrier, Fastening Screws, Planetary Gears, Needle Bearings, Snap Rings, Thrust Washers |
| Brake Group | 59-64 | Brake Counterdisk, Brake Disk, Wheel Carrier, Epicyclic Ring Gear, Kit Self-Adjust, Brake Piston, QUAD-Rings |
| Wheel Hub Group | 65-74 | Double U-Joint, Lock Ring, Wheel Carrier, Ring Gear, Bush, Bearing Cone, Bearing Cups, Seal Ring |
| Axle Beam Group | 75-79 | Double U-Joints, Slinger, Seal Rings, Bush, Upper King Pin Bush, Ball Bearing Cup |
| Differential Support Group | 80-90 | Seal Rings, Bushes, Ring-Nuts, Ring Nut Retainers, Differential Housing, Bevel Crown Gear, Adjuster Ring Nuts |
| Differential Group (ML) | 91-100 | Bevel Crown Gear, Bearing Cups, Differential Housing Cover, Differential Lock Piston, Side Gear, Planetary Carrier |
| Differential Group (LS) | 101-104 | Bevel Crown Gear, Bearing Cups, Differential Housing, Side Gear, Spider Gears, Thrust Washers |
| Pinion Group | 105-111 | Lock Nut, Retaining Washer, Bevel Pinion, Bearing Cones, Bearing Cups, Collapsible Spacer |
| Toe-In/Steering Angle | 112-115 | Linear Bars, Guide Rods, Joint Tie Rods, Lock Nuts, Mechanical Steering Stop, Stop Bolts |
| Testing After Assembly | 116-117 | Axle Lifting, Gear Engagement, Wheel Rotation, Brake Regulation |
| Troubleshooting | 118-126 | Axle Problems and Diagnosis |
| Special Tools | 127-130 | Interchangeable Handle, Wrench, Driver, False Differential Box Disk, False Pinion, Preloading Measurement Tool |
| Service Operations Time | 131-135 | Service Operations Time Schedule |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Bearing dimension A | 23.150 ÷ 23.250 mm | p. 72 |
| Bevel gear set backlash | 0.15-0.20 mm | p. 19 |
| Pinion shaft flange nut tightening torque | 460 Nm | p. 35 |
| Differential feed pressure | 20 bar | p. 19 |
| Differential feed pressure | 20 bar | p. 20 |
| Bearing dimension B | 77.275 ÷ 77.325 mm | p. 72 |
| Maximum operating pressure (brakes) | 42 bar | p. 21 |
| Steering angle | 55° | p. 20 |
| Axle oil change interval | 1500 hours | p. 31 |
| Check and adjust oil level interval | 300-400 hours | p. 31 |
| Greasing interval | 150-200 hours | p. 31 |
Carraro 20.26, 20.26 FR Common Problems This Manual Covers
Carraro 20.26 front axle bevel gear set making excessive transmission noise while driving
Check the oil level with the axle horizontal (page 29) and top up; replace poor grade or wrong lubricant. Measure ring gear to pinion backlash against 0.15-0.20 mm following page 86 and adjust. Adjust loose pinion or differential bearings and replace worn ones. Check pinion preload against Pm 31-45 N, measured without seal rings, per page 111. Replace a bent halfshaft.
Manual Section: Axle Problems and Diagnosis p. 125Front axle ring gear tooth found broken on the outer side during differential teardown
Replace the bevel gear set. The chart on page 123 ties outer side breakage to excessive gear load, excessive backlash, or a loose pinion nut. Set backlash to 0.15-0.20 mm on page 86. Replace the ring nut and collapsible spacer on reassembly (page 108), then tighten the ring nut gradually until preload reads Pm 31-45 N (page 111). If you overtighten it, replace the spacer and repeat.
Manual Section: Axle Problems and Diagnosis p. 123Axle gaskets and seal rings at the wheel hub or pinion flange leaking oil
Drain the axle with it horizontal, using the breather to release internal pressure first; page 29 warns of violent oil ejection. At the wheel end, crack the plug at its highest position first (page 30). Replace the gasket or seal and its matching surface if damaged, checking for a cut seal lip or wrong fitment. Never hammer directly on seals (page 10). Refill with correct oil and check level every 300-400 hours per page 31.
Manual Section: Axle Problems and Diagnosis p. 123Halfshaft broken at the wheel side with wheel vibration and front tyre resistance
Stop operating on a broken halfshaft; page 120 allows moving the machine only a few meters, engine off and unloaded. Replace the halfshaft, check the axle beam for bending, and confirm the wheel support is not worn or wrongly adjusted (page 124). Before pulling the king pins, secure the swivel housing to a hoist with a belt or rope (page 69).
Manual Section: Axle Problems and Diagnosis p. 124No differential action with the axle jamming while steering through tight turns
Verify the differential installation and check the lock command device for breakage or blockage; disassemble and inspect the components if needed, per page 120. On wide steering angle setups, reduce the steering angle and slow down when the axle starts to kick. Check the mechanical steering stop bolts following page 112 against the 55° steering angle listed on page 20.
Manual Section: Troubleshooting p. 120Uneven front tyre wear with partial wheel slipping when drive force is applied
Measure the rotation radius of both front tyres, then replace the tyre or adjust pressure until both match, per page 120. Remove excess weight and redistribute the load. Verify group integrity and wheel side bearings, then adjust wheel alignment. Check toe-in with the two linear bars fixed at their middle, perpendicular to the support surface and parallel to the pinion axis, following page 113.
Manual Section: Troubleshooting p. 120Frequently Asked Questions
What are the torque specifications for the Carraro 20.26 axle and brake bolts?
The tightening torques for various components are provided in section C.8. For example, the flange bolts are tightened to 226 Nm, the differential support bolts to 226 Nm, and the wheel hub bolts to 220 Nm. Refer to page 35 for the complete diagram of torque values. p. 35
What is the oil capacity for the differential and epicyclic reduction gear on the Carraro 20.26, 20.26 FR front axle?
The differential oil capacity is 8.5 liters. The epicyclic reduction gear oil capacity is 1 liter per side. These specifications are found in the technical features section for the axles. p. 20
What is the recommended oil specification for the Carraro 20.26 axle?
The recommended oil specification is API GL4/GL5, respectively MIL-L-2105/2105 D. Always use recommended oil enriched with additives. p. 20
Is this Carraro 20.26 manual a PDF I download?
You download the Repair Manual yourself: 135 pages, searchable PDF, available immediately. Keep a copy on every device you use.
Is printing allowed for this Carraro 20.26 Repair Manual?
Yes. Many buyers print one chapter at a time for their own shop and keep the rest on a tablet.
