Description
For Sale: All Nation Helical Gear Power Truck Tower Drive, Diesel (40″ Wheels), Assembled PN#9056BBNoPress or 9056BBPressed
Please specify if you want a specific upper drive shaft connection.
If this product is out of stock, please contact us to get on our waiting list. Let us know which type of mechanism is desired and how many will be needed to complete your project. We will contact you when they are available on a first come first serve basis.
We recommend the reader become knowledgeable about worm and worm gear mechanics, characteristics and terminology. Generally known as a Worm Drive consisting of the worm on the drive shaft and the worm gear on the axle, in this discussion below we refer to the worm gear on the axle as a spur gear even though this type of gear box worm can be regarded as a special case of a helical gear whereby the teeth on the axle worm gear are slightly angled.
Based on the original All Nation blueprints, the draftsman identified this gear unit as PN#4056. It was later renumbered in our catalog as #9027 and is sold with or without the Power Truck. The Tower Gear End numbered #4056 later renumbered in our catalog as #9056 for the helix gear implementation or 9056C for chain . The chain drive utilized Serv-O-Link parts and is a smooth running noise reduced mechanism.
This product is sold partially assembled with wheels and insulator insert. The insulated wheel must be determined on which side of the transmission before mounting on the axle.
Please Note: The axles on this transmission has been turned down to accommodate ball bearings in the truck side frame journal boxes. Previous Blomberg Truck kits had bronze bushings in the journals. Axles are still available for the older implementation if so desired however today we only have available Part #1013 PTFE bushings in place of the bronze.
The #9027 is also available in an easy to assemble kit. These gear units are available with various length drive shafts coming off the worm. Depending on how the gear unit is used, a double shaft may be desirable if powering the trailing truck in an engine.
Our drive units have been used not only in our F3/F7 and NW2 engines but also in other makes of diesels, Gas Electrics, M.U., Trolley/Traction models, Steeple Cabs to name a few. If a diesel modeler wanted dual powered trucks, our part numbers under auxiliary drive gear units were #9026 for F3 & F7, #9041 for NW2 Diesel Switcher or the more general number #9000 replacement truck. For this reason, side frames are not included with the constant torque drives because frames are usually part of all diesel loco kits or used in another manufacturers engine. For example, Kemtron GP-7, ALCOs and Traction cars utilized our gear units in their respective side frames. The traction cars often went with the 33″ or 36″ wheel sets in both 2 rail and uninsulated wheels for traction.
Comparing this gear unit to the ones we produced in the past, it should be noted that we improved our engineering to discontinue the use of steel sides on the gear housing PN#4039 and replaced with polycarbonate sides to reduce resonance noise that can be generated by the gears. The part number will remain 4039. In addition, the unit now comes with a bottom cover for the spur gear. This housing again is to reduce noise but also keep the gear clean and well oiled. The housing snaps on and off and is a good retainer for the #4037 axle bushing. The 4040 spacer bushings for the drive shafts are drilled and tapped for either a 2-56 or 3-48 by 5/32″ machine screw so the entire unit can be disassembled and serviced. The kit version of our small gear unit may not have the holes in the spacers drilled and tapped.
Reference Videos:
https://johnwubbel.com/crh/Brass-Investments-Project-Web-Show/AN_PowerTransmision_In_P&D_Truck.mp4
https://johnwubbel.com/crh/Brass-Investments-Project-Web-Show/AN_PowerTransmissions.mp4
Made In the USA.
The breakdown of parts for this gear unit follows:
Parts List PN#4056 Constant Torque Transmission Blueprint Section A
1 Drive Shaft PN#4045 1-1/4″ Long plus pin
4 Spacer Bushings For Drive Shafts PN#4040
1 Spur Gear i.e. Worm Gear for Axle PN#4052
2 Brass Axle Bushings PN#4073
1 Axle PN#1524
8 3-48 x 5/32″ Filister Head #C1301
8 Lock Washers #C2034 or C2031
12 Thrust Washers aka Shim Rings (note unit may only need a couple for fine tuning)
2 40″ wheels PN#2146 and PN#2147 (note may be substituted for 33″ or 36″ wheels)
2 Wheel Insulators (1 is a spare)
1 Worm #4051 (Worm may already be pressed onto shaft PN#4045)
2 Gear housing Side Panels PN#4038
1 Bottom Spur Gear Pan 3D Print PN#253AN
1 Upper Drive Shaft with ball #4042
1 Lower Drive Shaft Coupler #4041
1 Steel Helix Gear, Upper Drive Shaft #4049 to be mounted on #4042
1 Brass Helix Gear, Lower Drive Shaft #4050 to be mounted on #4041 spline
1 Upper Drive Shaft C Clip #C2036
