MANUALS FOR YOUR CCKW?
Posted: Fri Oct 27, 2006 2:54 pm
It is nice to have the Manusl that would have been issued with your CCKW as indicated on the Data Plate, they are fine to make your display complete. The best ones to work from are the ones that were late in WWII, those are; TM9-801 , the Operators Manual,April 44, TM9-1801 Power Train, Chassis, and Bodies, March 1944, and TM9-1802A Power Plant for the 2 1/2 ton Amphibian Truck, 6X6 (GMC DUKW-353) and 2 1/2 Ton Truck, 6X6 (GMC) July 1943.
The later Operators manual is for Open Cab, as is the Power Train Manual, but they reflect the latest maintenance techniques in serviceing updates, especially the Valve and Clutch adjustment. TM10-1563 has been mentioned as a good mid war manual, it is fine as it incorporates the Engine repair and Powertrain repair. It was published July, 1942 and does not indicate the upgrades in engine Tune Up Specs, Valve Adjustment, Clutch Adjustment, etc that the later 1944 manuals do. The upgrades to the Clutch, Valves, and Tune up applied to all older CCKWs. Not all TM10 Manuals had second printings, urgent upgrades were circulated to maintenance personell as Bulletins or MWOs. The TM9 Series reflect the majority of these bulletins. Something else to consider is that many of the 1941-42 CCKWs were upgraded at some point in their Army service life with later engines and mechanical components.
It is to the collectors advantage to buy as many of all of the CCKW manuals as possible in order to be familiar with the history of CCKWs, but to pay attention to the latest changes in engine specs so as to give your CCKW proper Care.
Valve adjustment upgrade applied to all, as it was based on reports from field engineers of potential valve failure during actual operating conditions.
The Clutch adjustment change reflected in later manuals giving more free travel was intended to ensure that the clutch would have a 1" minimum free travel at the pedal. The early adjustment did not allow for wear as it was found that 1 " was the minimum allowable free travel. By increasing it to 2 1/2" of free travel for a new clutch, it gave plenty range to the adjustment for wear until the minimum of 1" free travel was obtained. Once the wear progressed to the point where 1" could be obtained, the clutch was changed.
With several hundred thousand CCKWs in operation by mid 1943, it was determined that due to the wide range of operating conditions and the driving technique of the wide spectrum of drivers, that the clutches were subject to abuse and rapid wear. Thus the change in adjustment.
CCKWS were constantly being monitored by field reps from Ordnance and General Motors, they were out there, and made reports back to GM and the Chief of Ordnance. Their observations resulted to changes that were loosely inserted in manuals, or in MWOs and TBs issued to support personell.
There is more to CCKW history than neets the eye.
The later Operators manual is for Open Cab, as is the Power Train Manual, but they reflect the latest maintenance techniques in serviceing updates, especially the Valve and Clutch adjustment. TM10-1563 has been mentioned as a good mid war manual, it is fine as it incorporates the Engine repair and Powertrain repair. It was published July, 1942 and does not indicate the upgrades in engine Tune Up Specs, Valve Adjustment, Clutch Adjustment, etc that the later 1944 manuals do. The upgrades to the Clutch, Valves, and Tune up applied to all older CCKWs. Not all TM10 Manuals had second printings, urgent upgrades were circulated to maintenance personell as Bulletins or MWOs. The TM9 Series reflect the majority of these bulletins. Something else to consider is that many of the 1941-42 CCKWs were upgraded at some point in their Army service life with later engines and mechanical components.
It is to the collectors advantage to buy as many of all of the CCKW manuals as possible in order to be familiar with the history of CCKWs, but to pay attention to the latest changes in engine specs so as to give your CCKW proper Care.
Valve adjustment upgrade applied to all, as it was based on reports from field engineers of potential valve failure during actual operating conditions.
The Clutch adjustment change reflected in later manuals giving more free travel was intended to ensure that the clutch would have a 1" minimum free travel at the pedal. The early adjustment did not allow for wear as it was found that 1 " was the minimum allowable free travel. By increasing it to 2 1/2" of free travel for a new clutch, it gave plenty range to the adjustment for wear until the minimum of 1" free travel was obtained. Once the wear progressed to the point where 1" could be obtained, the clutch was changed.
With several hundred thousand CCKWs in operation by mid 1943, it was determined that due to the wide range of operating conditions and the driving technique of the wide spectrum of drivers, that the clutches were subject to abuse and rapid wear. Thus the change in adjustment.
CCKWS were constantly being monitored by field reps from Ordnance and General Motors, they were out there, and made reports back to GM and the Chief of Ordnance. Their observations resulted to changes that were loosely inserted in manuals, or in MWOs and TBs issued to support personell.
There is more to CCKW history than neets the eye.