Download Installation Instructions – Doc 1566-11 Rev IR 07/18/16 Page 1 of 8 Pages Installation Instructions for GROVE 28-4003 AND 28-4003A WHEEL AND BRAKE CONVERSION KITS
Document 13046-11 Rev H (October 10, 2024)

Introduction

This guide provides inspection, maintenance, and repair procedures for Grove FAA-TSO-C26d
Main Wheel & Brake assemblies (tested per ARP-5381). It is a reference for aircraft
manufacturers and maintainers to incorporate into approved airworthiness documents.

1. Brake Caliper Inspection & Maintenance

1.1 Visual Inspection

  • Inspect caliper body for corrosion, fluid leaks, cracks, or damage.
  • Verify back-plate tie-bolts are torqued, safety-wired, and secure.
  • Check torque plate for corrosion, cracks, and loose bolts.
  • Examine brake linings; replace if worn to <0.100″ or contaminated.
  • Inspect brake lines and fittings for damage or leakage.

2. Brake Lining Removal & Replacement

  1. Remove back-plate tie-bolts and back plate; slide caliper off torque pins.
  2. Drift out lining rivets (1/8″ drift), de-burr holes, and clean surfaces.
  3. Inspect back plate & press plate; straighten or replace if warped >0.010″.
  4. Rivet new linings with rivet tool #824; allow ≤2 cracks per 90° segment.
  5. Ensure linings are tight and immobile on plates.

3. Caliper Disassembly, Inspection & Repair

  1. Drain fluid, disconnect brake line, and remove back plate.
  2. Press piston out with low-pressure air (cover piston to catch it).
  3. Remove O-ring; replace if brittle, nicked, or damaged.
  4. Inspect caliper body, torque pins, and piston bore; reject any cracked or heavily worn parts.
  5. Clean parts (excluding O-rings, linings), install new/serviceable O-ring with Dow 55M lubricant.
  6. Reassemble piston into bore, mount press plate, torque back-plate bolts, safety-wire, and reconnect lines.

4. Bleeding & Conditioning

  1. Remove reservoir vent plug; attach hydraulic hand pump to bleeder valve.
  2. Open bleeder one turn; pump fluid until reservoir is near full.
  3. Tighten bleeder to 30–40 in-lb, replace vent plug, and verify a “hard pedal.”
  4. If “soft pedal,” repeat bleed steps.

5. Brake Pad Break-In

  1. Drag brakes while taxiing slowly with moderate power (no maximum braking).
  2. Allow 5–10 minutes cooling.
  3. Perform full static run-up; if brakes hold, break-in is complete; otherwise repeat.

Post Break-In: Inspect for fluid leaks or damage; clean rivet holes clogged with debris.

6. Wheel Assembly Inspection & Maintenance

6.1 Visual Inspection

  • Ensure wheel tie-bolts are secure.
  • Inspect wheel halves and brake disc for corrosion, cracks, or grooves.

7. Wheel Disassembly & Repair

  1. Deflate tire; remove hub cap, back plates, cotter pin, axle nut, and slide wheel off axle.
  2. Separate wheel halves on a clean, cushioned surface.
  3. Inspect bead seats, discs, and hub bores; repair or replace any damaged parts.
  4. Reassemble halves with new seals and bearings; torque bolts per wheel label.
  5. Reinstall wheel on axle, torque nut to preload bearings, install cotter pin.

8. Special Wheel Instructions

Tubeless Wheels: Follow manufacturer’s installation kit instructions and torque specs.

Amphibious Wheels:

  • Coat inside wheel halves with corrosion-inhibiting grease.
  • Incorporate a purge method (e.g., grease fitting) to expel water-ingress grease.
  • At each annual/100-hour inspection: remove bearings, inspect/repak with specified grease, clean halves, and reassemble.

Troubleshooting

Refer to the final section of the PDF for a detailed troubleshooting guide covering symptoms, causes, and corrective actions.

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