Sheff ṆẸẈ GẸṆỤỊṆẸ ỌẸṂ ṬỌṚỌ ṖẠṚṬ # 120-7043 ẠṚṂ ṢṖṚỊṆG ḞỌṚ ṬỌṚỌ ṬỊṂẸṂẠṢṬẸṚ ḶẠẈṆ ṂỌẈẸṚṢ

What It Is

The Sheff 120-7043 Arm Spring is a replacement torsion spring for the torque arm assembly on Toro TimeCutter and other compatible zero-turn lawn mowers. It provides the tension needed to engage and disengage the mower deck’s drive belt via the PTO system.

Fitment & Compatibility

Before buying, verify your mower’s model number and deck size (typically 42–60 inches). This spring fits many Toro TimeCutter, Titan, and Z-Master models, but cross-check with the OEM part number 120-7043. Measure the spring’s length (about 3.5 inches) and coil diameter (0.5 inch) to match your existing part. It’s an aftermarket replacement, not OEM, so confirm your original spring is identical in shape and wire gauge. Avoid assuming fitment based on brand name alone—use your mower’s serial number or parts diagram.

Key Things to Know

• Quality: Made from steel with a corrosion-resistant coating; generally reliable for the price, but some users report slightly thinner wire than OEM—check for consistent tension.
• Installation difficulty: Moderate. You’ll need a pry bar or spring tool to stretch the spring onto the torque arm and deck bracket. Expect some frustration if you’re not familiar with spring tension.
• Common gotcha: The spring can snap if over-stretched during installation. Work slowly, and consider wearing eye protection.
• Package: Comes as a single spring—no hardware or bushings included. You may need to reuse or replace the arm pivot bolt separately.

Should You Buy It

If you need a budget-friendly spring for a Toro zero-turn with a broken or sagging torque arm, this is a solid choice—just double-check fitment with your specific model and be prepared for a tight install. It’s not for heavy commercial use, but fine for residential mowing.