HOW-TO: Rapid Reload Head (AH1500) CLEANING

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  • Problem
  • Updated 9 months ago
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Problem Statement:
AH1500 Rapid Reload Head developed vibration after disassembly/cleaning/reassembly.

Background:
Having previously used the AH1500 Rapid Reload Head in wet and muddy conditions, I wanted to thoroughly clean the head, so I disassembled it.  After using it a couple different times, I noticed that the head was vibrating more than before.

Troubleshooting and Analysis:
To try and isolate the source of the vibration, I first tried the trimmer without any line installed, but the vibration was still there.  Next I removed the: Spool Retainer Assembly and spring (see figure 1); and when run (with the Spool Base and washer/nut), there was no vibration.  Next, I tried without the spring, but no difference.  At this point, I concluded that the vibration was coming from the Spool Retainer Assembly.

See Figure 2, upon disassembly of the Spool Retainer Assembly, I noticed a new groove/indentation in the Wire Holder.  When the Wire Holder is placed back into the Head Housing, there is a single groove that needs to line up.  If installed 180 degrees out, the assembly can be put back together, and you can tighten down the screws (not completely), and that is what caused the new notches to form. But the Wire Holder is sitting higher than normal.

Root Cause:
I did not review the manual prior to disassembly.  However, the manual does not contain specific details that would have drawn my attention to the nuance difference. Also, the tab and notch are hidden under the Location Housing, so you cannot visually verify correct assembly.

Recommendations:
Ego Team, to prevent incorrect reassembly, please consider adding amplifying details to the manual.  Suggestion: (Step 8 of the AH1500 manual, reference 2), "If Spool Retainer Assembly is disassembled, during reassembly, ensure that the notch in the Wire Holder is correctly aligned with corresponding tab in the Head Housing".

References:
(1) AH1500 product page:
https://cdn.shopify.com/s/files/1/0262/2513/files/AH1500_EGO_ST_Head_Manual_Fit_ST1500F_SFonly.pdf?3...
(2) AH1500 manual:
https://cdn.shopify.com/s/files/1/0262/2513/files/AH1500_EGO_ST_Head_Manual_Fit_ST1500F_SFonly.pdf?3...



Figure 1


Figure 2


Correct assembly pictured.  If incorrect, Wire Holder will sit up from the Head Housing; but it will be very difficult to verify as it could be off by only 1/32" - 1/8".

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(a)Typical Engineer

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Posted 9 months ago

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harryo

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Totally correct, and an excellent analysis only an engineer could do. The company needs to make the reload so you can only turn it in one direction to load, as I ran into a similar situation. As an electrical engineer and quality manager in a past life, excellent job.
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(a)Typical Engineer

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I always forget which way to wind it, so I look at the arrow on the guard, and turn it in the same direction (you can see it from the bottom too if it's not full of grass, which mine always is, so I have to flip it over). =)
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kenhigg

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If the tab and slot were taller it seems that would also make it more obvious if there was a misalignment issue. - ?


Edit: How is the good slot to the left of the bad slot in one pic and reversed in the other?

(Edited)
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(a)Typical Engineer

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Yes, a taller tab would prevent incorrect reassembly.  Also, if you zoom in on those images, can you see that the Wire Holder is sitting up from the Head Housing.

I think I missed the fact that there are two tabs, not one.  In the picture below, the orange has both tabs enclosed in boxes. And in the next picture, the green (GOOD) and red (WRONG) show what would happen if installed 180 degrees out.

I gave it some thought (but not much) on why Ego would position the tabs at 0 degrees and 150 degrees, rather than directly apart from each other (0 and 180).  As long as Slot Cover is prevented from being installed 0/180 vs. 90/270 in the picture below, then the line will be fed correctly.





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kenhigg

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My guess is the offset is there to maintain balance. And, you may have mentioned it but, you probably had it out by 180 and one tab aligned while the other wasn't and created the indention in the hub when it was tightened down. ?
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Amber F., Official EGO Rep

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Official Response
@(a)TypicalEngineer as you know, user feedback is always welcome and extremely valuable. I've sent this to our product development team for review. :-)