John Deere 90 Skid Steer Loader – Specs, Parts & Maintenance

Description:

The John Deere 90 Skid Steer Loader is a compact, vintage workhorse ideal for small farms, landscaping, and light-duty construction. As one of Deere’s earliest skid steer models, the 90 features a simple mechanical layout, chain drive, and gasoline engine—making it easy to operate, service, and repair. While less powerful than modern machines, it remains popular among collectors and small property owners for its reliability and low maintenance needs.

Specifications Overview:

• Engine:

  • Make/Model: Wisconsin VH4D

  • Type: Air-cooled, 4-cylinder gasoline

  • Displacement: 108 cu in

  • Horsepower: 30 hp

• Transmission:

  • Chain drive with dual-lever mechanical controls

  • 1-speed forward/reverse

• Hydraulics:

  • Standard Flow: 6–8 gpm (estimated)

  • Hydraulic Pressure: ~2,000 psi

  • Pump Type: Gear-driven

• Dimensions & Weight:

  • Operating Weight: ~2,800 lbs

  • Rated Operating Capacity: ~900 lbs

  • Tipping Load: ~1,800 lbs

  • Width Over Tires: ~48 in

  • Overall Height: ~66 in

  • Lift Height to Hinge Pin: ~96 in

Maintenance & Replacement Parts:

Even with its age, the JD 90 remains serviceable thanks to its straightforward design and availability of key replacement parts.

• Commonly Replaced Components:

  • Chain drive sprockets and axles

  • Hydraulic cylinder seal kits

  • Loader bushings and pins

  • [Engine parts for Wisconsin VH4D (external sources)]

• Common Issues & Fixes:

  • Chain Slack or Breakage: Inspect drive chains and sprockets—replace if worn.

  • Hydraulic Weakness: Check for leaks or degraded pump seals.

  • Engine Hard Starting: Clean carburetor, inspect ignition, and check fuel quality.

Pro Tips:

• Serial number is typically found on a plate near the loader arm pivot or rear tower.

• Use non-detergent motor oil in older Wisconsin engines unless upgraded.

• Grease all pivot points and inspect chaincase oil regularly.