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TD124 mkII Project sn 64950

unpacking:

notes: shipped via UPS

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Inspection: Visual

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Prior to disassembly:

visuals of the external features
Power it up, operate to 33-1/3rd rpm (116 vac)

I noticed that the strobe lit immediately.  It took 30 seconds for the platter to come up to speed.  The strobe did stabilize but seemed to hunt slightly and never hold a rock steady position.  The speed shift - on/off knob was stiff and loud.  When operated the linkage felt and sounded like it had been dry for quite some time.  That was all I needed to know.  I powered it down and began disassembly.  This unit has been in storage for a long, long time.  But somebody took care to not damage it, which makes this seem like an excellent specimen for refurbish.

After disassembly:  

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DSC_2726.jpg (312645 bytes) Rust.  By the look of it.

DSC_2729.jpg (213957 bytes) Rust has eaten into the thrust washer for the eddy brake rotator cup.

DSC_2730.jpg (182628 bytes) It appears someone has taken pliers to the bushing housing of the stepped pulley.  To remove it.  And then gave up.

DSC_2727.jpg (339450 bytes) More rust in the cam follower (roller)

DSC_2728.jpg (299286 bytes) Rust on the parts that can.

But now there are some key parts that show considerable rust.  This explains the stiff and noisy operation of the speed shift function.

 

Meantime.  A TAD ML-2 plinth for this TD124 mkII has been ordered.  It is under construction as I type.

 

Preliminary Clean-up:

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Naval Jelly does dissolve rust.  I've used it on 4 parts.  The rust has eaten into this stepped pulley hub deeply.

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Above: additional applications of Naval Jelly dissolve the remaining rust.

Cam follower roller/adjuster. 

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The roller was found rusted-stuck.  (Egad!) This, no surprise, is the main reason the speed select operation was incredibly stiff and noisy. After Naval Jelly, then hours of soaking in various different weight oils, it now rolls smoothly and without resistance.  The final lube in use is a Synthetic 75-140 differential lube.  The cam follower is constantly under pressure.

64950 Assembly

The motor clean-up lube and assembly, already documented within this td124 department, has been followed here.  

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Parts replaced:

main platter bearing bushing sleeves
main platter bearing thrust pad replaced with Torlon 4301 pad.
main platter bearing cap gasket.
rubber mounting grommets for the E50 (6 each)
E50 bearing thrust pad is replaced with Torlon 4301 pad.
stepped pulley brg. thrust pad replace with a Torlon 4301 pad.
clutch friction pads
flywheel friction/isolation pucks

 

  DSC_2713.jpg (249261 bytes) before with the 4 large diameter silicone pucks.  The problem with the silicone pucks was that the pucks were spaced out on too large of a radius that entirely misses the clutch pressure plate on the underside of the upper platter.  

DSC_2770.jpg (273412 bytes) after with the silicone pucks removed and cork/rubber pucks installed in the original location 

DSC_2749.jpg (258798 bytes) test fitting prior to chassis assembly.

New plinth

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new plinth with renewed td124 mkII

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Above: client supplied cocobolo armboard cut to mount an SME IV.

observations:

Platter speed comes right up when switching on to 33-1/3rd rpm from cold start. Less than two revolutions!  We have a strong E50 motor in this sample!
The E50 on this sample had very straight and flat stator core laminates. Minimal adjustment to bearing centering resulted in a very true and free spinning motor rotor. The coil windings had a clear and fresh looking insulation about them.  Which indicates this motor hasn't gotten very hot in the past.  A good sight.
I noticed rim height of the light upper aluminum platter was less than standard by .025".  This caused some concern on getting correct clutch settings without having to set the clutch too high to the point of scraping the underside of the flywheel. But it operates correctly now. 
The upper aluminum platter is straight and runs true.
Speed change operation after correcting a frozen-up rusty mess is now smooth and makes soft solid noises when being operated.  Smooth, quiet and robust.
Speed selection is positive and quick.
All 4 speeds operate efficiently   Although the strobe on the non-magnetic platter only observes two speeds; 45 and 33.
which reminds me, the strobe lamp lights strong and steady. 
about the non-magnetic platter.  This is a casting that was first used on the td135.  For the td124 it has been machined to fit an adaptor plate that fits over the td124 main bearing shaft. The platter does not self-align to this shaft.  Far from it, it requires an alignment process using a dial indicator and small adjustments to get it to spin concentric with the main bearing shaft. A necessary process because if not carried out, the off center condition will result in audible and visible (on the strobe) wow.