New compact loader backhoe from Allmand Bros
Published in: Diesel Progress North American Edition
Date: 9/1/2005
By: Wolfe, Michael D.
Allmand Bros. Inc., Holdrege, Neb., has expanded the top end of its TLB line of tractor loader backhoes. The TLB-6235 has an operating weight of 5800 lb. and is the first model in the company’s TLB line to feature a full-time mechanical four-wheel-drive system.
The drivetrain was designed with Allmand’s trademarked Extended Service Life (ESL) design concept. “Within the ESL concept, we look to use components that exceed the norm in that class of equipment,” said Doug Dahlgren, product manager at Allmand. “So when we designed the drivetrain for the 4×4 system, we used planetary axles, front and rear, and we used a premium servo-controlled hydrostatic transmission compared to a manual-controlled hydrostat that a lot of companies use in this class of equipment.”
The tractor is powered by a liquid-cooled Isuzu 3CD1 diesel engine rated 35 hp. The engine drives an Eaton hydrostatic transmission incorporating an Eaton axial piston motor with a displacement of 82 cc/rev. The servo-controlled transmission provides positive neutral and infinite control of the machine as well as reduced pedal effort, the company said. The transmission, which drives the Corner planetary front and rear axle assembly, is housed in cast iron to reduce noise. Operating speed range for the 18.2 ft. machine is infinitely variable from zero to 7.5 mph.
Steering is through an Eaton load sensing steering unit that requires hydraulic flow only when the operator turns the steering wheel. The hydraulic system also incorporates a high-capacity hydraulic oil cooler from Hayden.
The backhoe features Allmand’s heavy-duty boom lock and also incorporates its ESL design. Here, the ESL system includes hard chrome, oversized pins with Garlock composite, poly-lined bearings and urethane lip seals in all working joints to reduce friction and eliminate metal-to-metal contact. According to Dahlgren, the ESL design in the backhoe has been so effective that the company has had reports of machines with 1000 to 1500 hours of work with no noticeable wear on the joints.
The 6000 lb. class backhoe can reach down to a 9.8 ft. digging depth, with a dual-cylinder 180[degrees] hydraulic cushioned swing, controlled by Walvoil joystick controls.
“The 6235 is primarily designed for the rental industry,” said Dahlgren, “If you rent a piece of equipment for a week or month, it may never get serviced. So with the ESL concept we’ve been able to greatly reduce wear on the joints and provide superior performance in the drivetrain, ultimately making the machine more productive and increasing its service life.”
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