Peelle freight doors at each landing just above the zone christmas tree contacts there is a box which houses two seperate dials which one on the bottom I believe controls the open..hi speed /slowdown microswitch and final limits also when the cam drops there are three hi speed contacts (zone swith box for both open and closed operations as well as doorlock contacts..make sure these contacts are clean and have good continuity they provide the power feeds for each set of door motors..also make sure the chain tensions are equal so that both motors are pulling the weight of the doors the same...machine room Peelle controller has relays which control hoistway door hi/lo speed as well as gate hi/lo speeds...slowdown switches as mentioned above need to activate 12'' before open/close operation..also clean motor drive sheaves and chains too much oil on the drums will cause doors to loose traction in the open and close and will cause a speed decrease as well..thats all I can remember hope this helped you..
