Kind of late now, but that link is for the wrong Garrard model. It's for the Model 70, which was the upgraded version of their 1970s low-priced record changer chassis.
The TYPE A70 was the upgraded Type A and was a much superior unit. Unfortunately Vinyl Engine does not have a service manual for the Type A or Type A70 (or the identical, two-years newer 70 Mk II) in the library. In fact they don't have the owner's manual for the Type A70/70 Mk II. Maybe I should scan mine and send it to them!
At their age, most Type A70s don't work well any more because the rubber on the idler has aged and has lost its grippiness; and the lube grease in their mechanisms has dried out and hardened. On the worst of them the main cycling gear has frozen onto its shaft. Extensive disassembly is needed to get the gear off the shaft so that dried out grease can be washed out. Cleaning and lubrication of pretty much the entire mechanism gets done during this disassembly. The idler drive linkages get stiff or frozen due to dried out grease, too. Also the motor probably needs at least a relubrication by now. It seems like a lot of work (and it is) but anything mechanical needs this kind of service after all this time...the Type A70 was sold in 1964-1966, so they have been out there a LONG time.
Once you're all done and it's working as designed, you will have a very nice record changer...if you do wish to stack records, its changer mechanism is the gentlest ever made. I have a Garrard Type A70 in my bedroom system (and a Garrard 301 in the main system) and I like mine, very much. Right now, I've even got another one on the kitchen table being reconditioned...and yes, it does have the main cycling gear frozen to its shaft!