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