Restoration Of The Transmission

Updated: Jul 19

We strive for perfection in our work. The restoration of the massive Simplex four speed transmission was not particularly difficult although there were a few glitches along the way.


The transmission was far too heavy to remove by hand! After careful consideration and discussion, we agreed to lift the vehicle and use a hydraulic engine hoist to support and then lower the transmission during the removal. The transmission had to be removed before the engine.

 

The transmission coming off the hoist carriage


Outside view of the transmission case with clutch adjustment cover and shifting / emergency brake cap removed

Note: the service brake assembly and forward universal joint housing are still attached


Transmission with side cover removed for beginning inspection and cleaning


Inside transmission with shifting rails removed


Transmission side cover and attached emergency brake actuator with arms after cleaning


Rear main shaft bearing retainer and bearing before cleaning


Reference picture for reassembly


Shifting rails in the process of being removed

Note: Both arm slots which are moved by the shifting cane


Reference picture for reassembly showing high quality forged steel shifting rails and integral forks


Shifting detent spring and ball


Transmission with main shaft, sliding gears and shifting rail shafts removed


Pilot shaft with clutch brake


Counter shaft during removal

Note: Reverse idler gear and shaft are still in place


First gear with a broken tooth, a new gear was machined and hardened as a replacement


Transmission / clutch case after thorough cleaning. After careful masking we coated the inside of the transmission case with Glyptal.


Forward view of transmission / clutch case


Inside of transmission case after application of Glyptal


Pilot shaft and clutch brake after restoration


Pilot shaft and main shaft after restoration


Countershaft bearing retainers


Transmission parts after restoration


Countershaft assembly


Countershaft and sliding gears



Transmission with countershaft, mainshaft, and gears assembled


Transmission fully assembled without covers


Transmission fully assembled including shifting and emergency brake levers and ready for installation


Left side view after installation


Right side view after installation

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