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Author Topic: Farish 8126 HST Intercity 125 Problems  (Read 280 times)

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Offline maridunian

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Farish 8126 HST Intercity 125 Problems
« on: December 07, 2018, 01:44:03 PM »
A friend has asked me to sell some old (long unused) N Gauge items for charity. Included is a Farish 8126 HST Intercity 125 set. The power car wouldn't run, so a quick strip down revealed a healthy motor, but the gear trains seized in both bogies. Oiling and gentle pushing and pulling whilst off the chassis got them freed up, but still binding too often for the motor to cope with.

Is there any hope for further TLC, or are new bogies the only way forward (or backward)?

Mike
« Last Edit: December 07, 2018, 01:45:11 PM by maridunian »

Offline Steven B

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Re: Farish 8126 HST Intercity 125 Problems
« Reply #1 on: December 07, 2018, 02:33:21 PM »
Sounds like split gears.

Remove each wheel set from the bogie in turn and check that the gear doesn't spin on the axle. Ditto the idler gears. BR Lines or Peter's Spares may have replacements.

Steven B.

Offline maridunian

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Re: Farish 8126 HST Intercity 125 Problems
« Reply #2 on: February 12, 2019, 03:51:47 PM »
Thanks Steven.

Have now replaced axles and gears in each bogie. The loco runs well in one direction, but slowly in the other. I can't understand why that might be. Ideas anyone?

Mike

Offline Dr Al

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Re: Farish 8126 HST Intercity 125 Problems
« Reply #3 on: February 12, 2019, 06:59:38 PM »
Clean all gears (they need to be fully free and can get very gummed up with old lubricant), clean out commutator, and clean all bearings. Sounds like excess drag somewhere - could be a worn or age-ing bearing.

Cheers,
AlLan
Quote from: Roy L S
If Dr Al is online he may be able to provide a more comprehensive answer.

“We have also arranged things so that almost no one understands science and technology. This is a prescription for disaster. We might get away with it for a while, but sooner or later this combustible mixture of ignorance and power is going to blow up in our faces.” – Dr. Carl Sagan

Offline maridunian

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Re: Farish 8126 HST Intercity 125 Problems
« Reply #4 on: February 18, 2019, 08:48:56 AM »
Thanks Alan

The new gears and axles in the unmounted bogies weren't running completely smoothly and on close inspection I could see they were twisting slightly out of line when under load. New gear towers solved that, but still asymmetric speeds when running.

Turned attention to motor housing next. The bolt heads showed some evidence of over tightening and when I removed the battery box/fuel tank moulding I could see that the magnet side plates were pinched inboard of their slots, touching the armature. Careful reassembly sorted that, and it's now running well.

Refurbished set now available to buy on eBay:

https://www.ebay.co.uk/itm/Graham-Farish-8127-HST-125-Set-Intercity-Swallow-Livery-/192829399164

Mike
« Last Edit: February 18, 2019, 11:36:00 AM by maridunian »

 

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