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This Caterpillar D9 is equipped with a No.30 front PCU, a ‘beefed-up’ version of the company’s No.24 PCU that was fitted to D8 and D7 tractors. Due to its location on the tractor, the No.30 (and No.24) was a little more difficult to work on when repairs were required Heavy Construction Equipment, Heavy Equipment, Caterpillar, Inventions, Tractors, Difficult, Cable, Version, Control
Equipment Controls – the cable era
This Caterpillar D9 is equipped with a No.30 front PCU, a ‘beefed-up’ version of the company’s No.24 PCU that was fitted to D8 and D7 tractors. Due to its location on the tractor, the No.30 (and No.24) was a little more difficult to work on when repairs were required
NZ Contractor magazine
NZ Contractor magazine
From my own collection, a small selection of PCU’s fitted to the rear of three 1:25 scale models in the ‘Retro Contractors’ collection. From left to right: Caterpillar No.25 double drum, with cable routed to the front for the blade. Centre: Garwood 240 series on the rear of an Allis-Chalmers HD21. Right: LeTourneau Model N double drum, also with cable routed to the front. New Tractor, Garwood, Dozer, Scale Models, Drum, Blade
Equipment Controls – the cable era
From my own collection, a small selection of PCU’s fitted to the rear of three 1:25 scale models in the ‘Retro Contractors’ collection. From left to right: Caterpillar No.25 double drum, with cable routed to the front for the blade. Centre: Garwood 240 series on the rear of an Allis-Chalmers HD21. Right: LeTourneau Model N double drum, also with cable routed to the front.
NZ Contractor magazine
NZ Contractor magazine
Schield C-35 in dragline mode with the standard crane boom and perforated drag bucket which held almost ¾ cubic yard. This surviving example lives on a farm and is used for drainage work. Crane Boom, Drainage, Perforated, Example, Survival, Bucket, Farm, Standard, Activities
Schield C-35 Bantam
Schield C-35 in dragline mode with the standard crane boom and perforated drag bucket which held almost ¾ cubic yard. This surviving example lives on a farm and is used for drainage work.
NZ Contractor magazine
NZ Contractor magazine
Another surviving Schield C-35, this time a backhoe variant. It is an extremely simple and straightforward design, with no double reeving of any of the cables. The bucket could be adjusted to vary the angle of penetration by removing the pin and moving the link further up the stick to any of 5 different locations. Cable Machine, Pin, Simple, Design, Buckets
Schield C-35 Bantam
Another surviving Schield C-35, this time a backhoe variant. It is an extremely simple and straightforward design, with no double reeving of any of the cables. The bucket could be adjusted to vary the angle of penetration by removing the pin and moving the link further up the stick to any of 5 different locations.
NZ Contractor magazine
NZ Contractor magazine
Pictured at a vintage machinery show in the USA, a Schield C-35 rigged as a face shovel awaits its turn to do some digging. Note the simple, uncomplicated look of the whole machine. Classic, Vintage, Machinery, Turn Ons, Machine, Uncomplicated, Dig, Quick
Schield C-35 Bantam
Pictured at a vintage machinery show in the USA, a Schield C-35 rigged as a face shovel awaits its turn to do some digging. Note the simple, uncomplicated look of the whole machine.
NZ Contractor magazine
NZ Contractor magazine
While still retaining its original Chrysler engine, this restored Schield C-35 backhoe has had its undercarriage replaced with some more modern triple grouser shoes and chains, the original side-pinned flat shoes being obviously too hard to find to complete the restoration. Truck Cranes, Flat Shoes, Chrysler, Chains, Engine, Restoration, Hard
Schield C-35 Bantam
While still retaining its original Chrysler engine, this restored Schield C-35 backhoe has had its undercarriage replaced with some more modern triple grouser shoes and chains, the original side-pinned flat shoes being obviously too hard to find to complete the restoration.
NZ Contractor magazine
NZ Contractor magazine
Restored C-35 dragline in action doing some farm drainage. What makes this unit special is that it is still in use by a contractor! The undercarriage has been replaced with modern triple grouser shoes and the unit has also been repowered with a diesel engine (type unknown). Engine Types, Diesel Engine, Unknown, Action, The Unit
Schield C-35 Bantam
Restored C-35 dragline in action doing some farm drainage. What makes this unit special is that it is still in use by a contractor! The undercarriage has been replaced with modern triple grouser shoes and the unit has also been repowered with a diesel engine (type unknown).
NZ Contractor magazine
NZ Contractor magazine
Two of the author’s three Schield C-35 Bantam excavator models (the face shovel was in storage when this photo was taken). These are to 1:25 scale and were offered by diecast maker Spec-Cast and are fully operable. They are great models and capture the simplicity of the real thing well. Custom Toys, Shovel, Diecast, Scale, Capture, Maker, Motorcycle Posters, Author
Schield C-35 Bantam
Two of the author’s three Schield C-35 Bantam excavator models (the face shovel was in storage when this photo was taken). These are to 1:25 scale and were offered by diecast maker Spec-Cast and are fully operable. They are great models and capture the simplicity of the real thing well.
NZ Contractor magazine
NZ Contractor magazine
‘Play Day’ at the Historical Construction Equipment Association in Kentucky USA sees this C-35 shovel equipped Bantam move a bit of dirt around. The C-35 shovel was an ideal sized machine for small quarries or pits. Play Day, Kentucky, Dirt, Ideal, Big Time
Schield C-35 Bantam
‘Play Day’ at the Historical Construction Equipment Association in Kentucky USA sees this C-35 shovel equipped Bantam move a bit of dirt around. The C-35 shovel was an ideal sized machine for small quarries or pits.
NZ Contractor magazine
NZ Contractor magazine
Mounted on a 6x6 custom carrier, this Schield C-35 is yet another survivor, and a rare one at that. Another section could be inserted into the boom, but that reduced the size of the dragline bucket that could be fitted. This example id fitted with the standard 5/8 yard digging bucket. (Photo: Internet) Survivor, Reduced, Boom, Internet, Yard
Schield C-35 Bantam
Mounted on a 6x6 custom carrier, this Schield C-35 is yet another survivor, and a rare one at that. Another section could be inserted into the boom, but that reduced the size of the dragline bucket that could be fitted. This example id fitted with the standard 5/8 yard digging bucket. (Photo: Internet)
NZ Contractor magazine
NZ Contractor magazine
Pictured at a scrapper's yard in the USA is this example of a Schield C-35 shovel mounted on a custom made Ford 6x6 carrier with a very home-made half-cab. It is not known if the unit survived or not. Cab, Monster Trucks, Ford, Custom, Dustpan
Schield C-35 Bantam
Pictured at a scrapper's yard in the USA is this example of a Schield C-35 shovel mounted on a custom made Ford 6x6 carrier with a very home-made half-cab. It is not known if the unit survived or not.
NZ Contractor magazine
NZ Contractor magazine
A ‘near naked’ Wooldridge TC-S14 Terra Cobra getting a push from an International TD-24. Site service personnel have removed all the engine side panels to allow easier access to the troublesome steering chain. The supercharger for the Cummins HBIS-600 engine can be clearly seen as well as the hydraulic tank for the steering system. Pressed Steel Toy, Yard Machine, Air Brake, Reverse Gear, Hydraulic Cylinder
Wooldridge’s first motor scraper
A ‘near naked’ Wooldridge TC-S14 Terra Cobra getting a push from an International TD-24. Site service personnel have removed all the engine side panels to allow easier access to the troublesome steering chain. The supercharger for the Cummins HBIS-600 engine can be clearly seen as well as the hydraulic tank for the steering system.
NZ Contractor magazine
NZ Contractor magazine
The Ministry of works owned two Euclid C-6’s, one GM powered, the other Cummins powered. This is the GM-powered example, seen at Benmore around 1961. The dozer blade is by Garwood, the radial arc ripper on the rear is an Ateco product. Construction Machines, Construction Equipment, Earth Moving Equipment, Crawler Tractor, Classic Tractor, Torque Converter, Euclid
The Euclid C-6 tractor
The Ministry of works owned two Euclid C-6’s, one GM powered, the other Cummins powered. This is the GM-powered example, seen at Benmore around 1961. The dozer blade is by Garwood, the radial arc ripper on the rear is an Ateco product.
NZ Contractor magazine
NZ Contractor magazine
The ‘Giant Ripper’, Komatsu’s term for the lethal looking single shank ripper fitted to the rear of this D455A and subsequent (D475 and D575) ‘Super Dozers’. Barely discernable in this photo is the escape hatch cut in the roof of the ROPS to allow the operator a hasty exit if necessary. Cummins Diesel Engines, The Holt, Tractors For Sale, Imperial Japanese Navy, Motor Grader
Super-dozer – the Komatsu D455A
The ‘Giant Ripper’, Komatsu’s term for the lethal looking single shank ripper fitted to the rear of this D455A and subsequent (D475 and D575) ‘Super Dozers’. Barely discernable in this photo is the escape hatch cut in the roof of the ROPS to allow the operator a hasty exit if necessary.
NZ Contractor magazine
NZ Contractor magazine
A 3-shank Ateco Vyba ripper fitted to the rear of a GM 8V-71 powered Michigan 280-III wheel dozer. The dense rubber blocks which were compressed by the top of the partially moveable ripper shank are clearly visible. Photo is from 1968. Tractor Attachments, Michigan, Dense, Shank, Rubber
Forgotten companies - ATECO
A 3-shank Ateco Vyba ripper fitted to the rear of a GM 8V-71 powered Michigan 280-III wheel dozer. The dense rubber blocks which were compressed by the top of the partially moveable ripper shank are clearly visible. Photo is from 1968.
NZ Contractor magazine
NZ Contractor magazine
A Cletrac Model 100 track type tractor tows an Austin-Western “Giant Ripper”, 1935. This all-hydraulically operated ripper was available up until WWII. While the little Cletrac may have been able to tow the ripper around, the Author doubts very much if it could have used it effectively with all three shanks fitted. Hydraulic Pump, Hydraulic Systems, Dump Carts, Austin Brand, Chenille, Innovative Companies, Vintage Tractors, Back Road
Forgotten companies: Austin Western
A Cletrac Model 100 track type tractor tows an Austin-Western “Giant Ripper”, 1935. This all-hydraulically operated ripper was available up until WWII. While the little Cletrac may have been able to tow the ripper around, the Author doubts very much if it could have used it effectively with all three shanks fitted.
NZ Contractor magazine
NZ Contractor magazine
A Cletrac Model 100 track type tractor tows an Austin-Western “Giant Ripper”, 1935. This all-hydraulically operated ripper was available up until WWII. While the little Cletrac may have been able to tow the ripper around, the Author doubts very much if it could have used it effectively with all three shanks fitted.
Forgotten companies
A Cletrac Model 100 track type tractor tows an Austin-Western “Giant Ripper”, 1935. This all-hydraulically operated ripper was available up until WWII. While the little Cletrac may have been able to tow the ripper around, the Author doubts very much if it could have used it effectively with all three shanks fitted.
NZ Contractor magazine
NZ Contractor magazine
Although not the worlds greatest photo, the image shows a Garwood C-80 cable operated ripper from 1947. This ripper was also available in a hydraulically operated version, the model H-80. Very few were manufactured. The World's Greatest, Image Shows, Great Photos, Manufacturing
Early development of the ripper- it started with a rooter
Although not the worlds greatest photo, the image shows a Garwood C-80 cable operated ripper from 1947. This ripper was also available in a hydraulically operated version, the model H-80. Very few were manufactured.
NZ Contractor magazine
NZ Contractor magazine
From 1935, an Austin-Western ‘Giant Ripper’ behind a very early Cletrac crawler. Although R.G. LeTourneau invented the towed ripper, other manufacturers were not slow in copying the design. It is very interesting to see hydraulics applied to a piece of equipment this early in the evolution of earthmoving equipment. The ‘Giant Ripper’ was only in production from 1935 to 1940. Evolution, Westerns, Slow, Equipment, Early
Early development of the ripper- it started with a rooter
From 1935, an Austin-Western ‘Giant Ripper’ behind a very early Cletrac crawler. Although R.G. LeTourneau invented the towed ripper, other manufacturers were not slow in copying the design. It is very interesting to see hydraulics applied to a piece of equipment this early in the evolution of earthmoving equipment. The ‘Giant Ripper’ was only in production from 1935 to 1940.
NZ Contractor magazine
NZ Contractor magazine
Wooldridge Manufacturing offered three different models of cable operated ripper depending on what its customers required. This is a model RS-3, smallest of the three models, designed for use behind tractors of 70 horsepower or greater. Wooldridge manufactured these up until they were bought out by Curtiss-Wright. Horsepower, Wright, Greater, Models
Early development of the ripper- it started with a rooter
Wooldridge Manufacturing offered three different models of cable operated ripper depending on what its customers required. This is a model RS-3, smallest of the three models, designed for use behind tractors of 70 horsepower or greater. Wooldridge manufactured these up until they were bought out by Curtiss-Wright.
NZ Contractor magazine
NZ Contractor magazine
Caterpillar No.28 towed ripper behind a Cat D8. Also bearing a strong resemblance to LeTourneau’s rippers, Caterpillar’s No.28 and No.18 were manufactured from just after WW2 through to the early 1950s Hampshire, Ww2, 1950s, Strong
Early development of the ripper- it started with a rooter
Caterpillar No.28 towed ripper behind a Cat D8. Also bearing a strong resemblance to LeTourneau’s rippers, Caterpillar’s No.28 and No.18 were manufactured from just after WW2 through to the early 1950s
NZ Contractor magazine
NZ Contractor magazine
If you needed a really serious ripper, you need look no further than CRC-Kelley who made some of the most vicious looking rippers your author has ever seen. This deep ripping example is fitted to an Allis-Chalmers HD-41, itself, no small beast. Beast, Deep, Development, History
Early development of the ripper- it started with a rooter
If you needed a really serious ripper, you need look no further than CRC-Kelley who made some of the most vicious looking rippers your author has ever seen. This deep ripping example is fitted to an Allis-Chalmers HD-41, itself, no small beast.
NZ Contractor magazine
NZ Contractor magazine
Although Isaacson was not a common name among NZ contractors, its manufactured dozer blades, scrapers and PCUs on the west coast of the USA, that were very popular. Pictured is an Isaacson model H front mounted PCU with high lift blade frame, fitted to a Cletrac tractor. This arrangement was especially popular amongst loggers due to the high clearance and lift provided that prevented hang-ups, and was good for log stacking. Logger, Towing, West Coast, Clearance, Common, Arrangement
Equipment Controls – the cable era
Although Isaacson was not a common name among NZ contractors, its manufactured dozer blades, scrapers and PCUs on the west coast of the USA, that were very popular. Pictured is an Isaacson model H front mounted PCU with high lift blade frame, fitted to a Cletrac tractor. This arrangement was especially popular amongst loggers due to the high clearance and lift provided that prevented hang-ups, and was good for log stacking.
NZ Contractor magazine
NZ Contractor magazine
Bucyrus-Erie Model P-24 double drum rear mounted PCU fitted to an International TD-18 track type tractor. Bucyrus-Erie had long business associations with I-H and were a major supplier of PCU’s, dozer blades and towed scrapers right up until the early 1960s. Bucyrus Erie, International Tractors
Equipment Controls – the cable era
Bucyrus-Erie Model P-24 double drum rear mounted PCU fitted to an International TD-18 track type tractor. Bucyrus-Erie had long business associations with I-H and were a major supplier of PCU’s, dozer blades and towed scrapers right up until the early 1960s.
NZ Contractor magazine
NZ Contractor magazine
An interesting partial cutaway image of a Garwood CU-2 rear mounted cable control unit. Garwood supplied a number of the major tractor manufacturers with both attachments and PCU’s. The model CU-2 was widely used and discontinued in the early 1950s, being replaced by the model 240 and 241 PCU Tractor Manufacturers, Control Unit, Go Kart, Cutaway, Discontinued
Equipment Controls – the cable era
An interesting partial cutaway image of a Garwood CU-2 rear mounted cable control unit. Garwood supplied a number of the major tractor manufacturers with both attachments and PCU’s. The model CU-2 was widely used and discontinued in the early 1950s, being replaced by the model 240 and 241 PCU
NZ Contractor magazine
NZ Contractor magazine
Replacing the 2366, the 25 ton capacity model 2566B went through a couple of product improvements before becoming the model TA25. This smart looking example is up for auction in the USA Dump Truck, Articulated, New Beginnings, Dumped, Capacity, Auction
A new beginning – the Terex articulated dump truck
Replacing the 2366, the 25 ton capacity model 2566B went through a couple of product improvements before becoming the model TA25. This smart looking example is up for auction in the USA
NZ Contractor magazine
NZ Contractor magazine
An early Caterpillar 633 engaged in land levelling in the USA. The debris guard is still in place, comforting seeing the machine has no cab or ROPS. The photo gives a good sense of the brute elegance of the machine. Repair Manuals, Wheel, Debris, Service
The Caterpillar 633 elevating scraper
An early Caterpillar 633 engaged in land levelling in the USA. The debris guard is still in place, comforting seeing the machine has no cab or ROPS. The photo gives a good sense of the brute elegance of the machine.
NZ Contractor magazine
NZ Contractor magazine
Factory-fresh Caterpillar 633C on the dealers lot in the USA, 1970. This is a pre-ROPS, pre-cushion hitch example, but it does have a muffler! Life was much simpler then. Dumpsters, Muffler, Hitched
The Caterpillar 633 elevating scraper
Factory-fresh Caterpillar 633C on the dealers lot in the USA, 1970. This is a pre-ROPS, pre-cushion hitch example, but it does have a muffler! Life was much simpler then.
NZ Contractor magazine
NZ Contractor magazine
The 633 produced in the greatest quantities was the 633D version that was introduced in 1975. This is an early example with the headlights enclosed within the radiator guard (later build units have them mounted externally on the sides of the guard) Caterpillar Pictures, Caterpillar Equipment, Cars Trucks, Caterpiller, Heavy Equipment Operator, Cat Machines
The Caterpillar 633 elevating scraper
The 633 produced in the greatest quantities was the 633D version that was introduced in 1975. This is an early example with the headlights enclosed within the radiator guard (later build units have them mounted externally on the sides of the guard)
NZ Contractor magazine
NZ Contractor magazine
Given the popularity of Caterpillars push-pull system, it is not all that often that you see a post-1971 era Caterpillar 627 without one fitted. This photo however, dispels the myth and shows a 68M series 627 minus extras apart from a ROPS. Careful observation reveals where countless push loadings have worn the bottom of the scrapers push block profile down. Engin, Myths, System, Apart
The Caterpillar 627 scraper
Given the popularity of Caterpillars push-pull system, it is not all that often that you see a post-1971 era Caterpillar 627 without one fitted. This photo however, dispels the myth and shows a 68M series 627 minus extras apart from a ROPS. Careful observation reveals where countless push loadings have worn the bottom of the scrapers push block profile down.
NZ Contractor magazine
NZ Contractor magazine