How to Fix Grain Loss on New Holland CR Combine | Common Wear Parts Checklist

Grain loss is one of the most expensive problems a New Holland CR combine owner can face during harvest. Even a small increase in loss rate can turn into significant yield and income loss by the end of the season.

The good news is that most grain loss issues on a New Holland CR combine are not random. They are often linked to worn concaves, damaged grates, bent cutter bars, loose chains, or incorrectly adjusted settings. Once you identify the wear parts causing the problem, you can take action before harvest pressure increases.

This guide explains the most common causes of grain loss on New Holland CR combines and the wear parts you should inspect first.

Why Grain Loss Happens on New Holland CR Combines

Grain loss usually happens in one of three areas: the front end, the threshing and separation system, or the cleaning system.

Front-end loss is often caused by cutter bar damage, improper reel speed, or malfunctioning header parts. If the cutter bar is worn or damaged, it may not cut cleanly, allowing grain to fall back onto the ground.

Threshing and separation loss occurs when the rotor, concaves, and grates are not performing correctly. If concaves are worn or the rotor clearance is wrong, grain may not separate properly from the straw.

Cleaning system loss happens when sieves, chaffers, fans, and shoe parts are damaged or out of adjustment. Grain can be carried away with chaff and straw if the cleaning system is not working efficiently.

Understanding where the loss is happening is the first step toward fixing it.

Common Wear Parts to Inspect

1. Concaves

Concaves are among the most critical parts for threshing performance. If concave wires are worn, broken, or incorrectly adjusted, grain may pass through the rotor area without being properly separated.

Inspect the concave gaps and wire condition regularly. Replace worn or damaged concaves to help improve threshing results and reduce grain loss.

2. Grates and Separation Elements

Grates play an important role in grain separation. When grates are worn, bent, or blocked, separation efficiency drops.

Check for broken wires, worn edges, and material build-up. Make sure grain can fall through the separation area cleanly while straw continues moving toward the rear of the machine.

3. Cutter Bar and Knife Sections

A damaged cutter bar can cause poor cutting performance and header loss. If knife sections are worn, cracked, or missing, the header may not cut evenly.

Inspect the entire cutter bar assembly before harvest and during harvest intervals. Replace damaged knife sections and worn guards to maintain clean cutting performance.

4. Chains and Sprockets

Chains and sprockets drive critical components throughout the combine. If a chain is loose, stretched, or damaged, machine speed and timing can be affected.

Check feeder house chains, elevator chains, and other power-transmission components. Maintain proper chain tension and replace worn chains or sprockets before they cause a major breakdown.

5. Sieves and Chaffers

Sieves and chaffers help clean the grain after separation. If these parts are worn, damaged, or incorrectly set, clean grain may be lost along with chaff.

Inspect sieve holes, chaffer openings, and operating condition. Make adjustments based on crop type, moisture level, and harvest conditions.

6. Belts and Pulleys

Belts and pulleys support many rotating systems on a New Holland CR combine. A slipping or damaged belt can reduce fan speed, rotor speed, or other critical functions.

Check belt condition, tension, and pulley alignment. Replace worn belts before harvest season begins.

Adjustments That May Help Reduce Grain Loss

In addition to checking wear parts, review these machine settings:

• Rotor speed: Too fast or too slow can affect threshing and separation.

• Concave clearance: Adjust according to crop type and moisture level.

• Fan speed: Too high can blow grain out; too low can leave grain dirty.

• Sieve and chaffer settings: Match openings to the current crop conditions.

• Reel speed and height: Help reduce header loss during cutting.

• Feed rate: Avoid overloading the combine during tough harvest conditions.

Pre-Harvest Checklist for New Holland CR Combines

Use this checklist before harvest starts:

• Inspect concaves for wear or damage

• Check grates and separation elements

• Test cutter bar and knife sections

• Inspect chains, sprockets, and tensioners

• Check belts and pulleys for wear

• Inspect sieves and chaffers

• Verify fan and rotor speeds

• Clean the shoe and grain system

• Check hydraulic functions

• Test all safety systems

Final Thoughts

Grain loss on a New Holland CR combine is a serious issue, but it is often preventable. By inspecting concaves, grates, cutter bars, chains, sieves, and belts before and during harvest, you can reduce loss, protect yield, and improve profitability.

Regular maintenance and timely replacement of wear parts are two of the best investments you can make during harvest season.