Metabo HPT - Hitachi 985370 Second Hammer DH38YE DH40FR

The Metabo HPT - Hitachi 985370 Second Hammer DH38YE DH40FR is a replacement hammer mechanism component designed for proper impact action in compatible rotary hammer drills. Issues typically involve reduced hammering performance, wear, or installation-related problems.

This part fixes the following symptoms:

• Hammer function operates weakly during drilling.

• Reduced impact force while chiseling concrete.

• Excessive internal hammer mechanism noise.

• Intermittent hammer action under load.

• Worn or damaged second hammer affecting performance.

Weak Hammer Impact

Quick Check: Inspect the second hammer for wear, cracks, or surface damage.

Fix Suggestion: Replace the worn 985370 Second Hammer with a new compatible part.

Prevention Tip: Avoid prolonged operation under excessive load conditions.

Intermittent Hammering Action

Quick Check: Verify correct installation and alignment of the second hammer.

Fix Suggestion: Reinstall the component and inspect related hammer mechanism parts.

Prevention Tip: Perform routine maintenance and lubrication as recommended.

Unusual Internal Noise

Quick Check: Listen for metal-to-metal contact during hammer operation.

Fix Suggestion: Examine the second hammer and surrounding components for wear.

Prevention Tip: Replace worn impact parts before severe damage develops.

Loss of Chiseling Performance

Quick Check: Test hammer force against normal operating specifications.

Fix Suggestion: Replace damaged hammer components affecting impact transfer.

Prevention Tip: Use the rotary hammer only for intended drilling and chiseling tasks.

Customer Experience: After replacing the 985370 Second Hammer in my DH40FR, the hammering power returned to normal and concrete drilling became noticeably smoother, The part fit correctly in my DH38YE and resolved the weak impact issue I had been experiencing for several weeks.