. . . and more power for Guy tractive units
Page 30
If you've noticed an error in this article please click here to report it so we can fix it.
• Power ratios of up to 8.62 bhp /ton are now available for Guy Big I4T 32-ton tractive units following the announcement today of three new engine options for the range.
The options which are now available are the turbocharged Rolls-Royce Eagle Mark III 290 (developing 271 bhp net installed to BS AU 141a 1971), the Cummins NTL 290 (276 bhp) and the Gardner 8LXB (246 bhp). Power-to-weight ratios with these engines in vehicles operating at 32 tons gcw are 8.47, 8.62 and 7.7 bhp/ton respectively.
Borg and Beck twin-plate clutches and Fuller RTO 9509A range-change gearboxes are specified with crawler ratio of 8.76:1 and first gear of 5.861:1. Overdrive top on this nine-speed gearbox is 0.741:1. The nominal input torque limit of 900 lb ft IS well above the torque output of the
engine options concerned. The clutch is hydraulically operated with air assistance provided on Rolls-Royce and Cummins installations.
Air cleaners are rear-of-cab gantrymounted, a Cooper 14in. Cylopac being specified for Rolls-Royce and Gardner and a GKN Farr 48-cell Unipanic for the Cummins. Fan diameter has been increased to 24in. and radiators with an area of 8.37 sq ft are fitted for Rolls-Royce
and Cummins-engined vehicles while Gardner-engined units have 5.85 sq ft radiators. The former also have Viso F cold-start devices fitted. The new cab front panel which has recently been introduced to all Guy models is also fitted.
Behind the air cleaner gantry a new underframe is now common to all Guy tractive units.