Articulated handler line-up extended JCB has added to its popular Telemaster range with a new, higher capacity flagship. David Williams test drove the new machine. Telemaster (TM) models have an articulated chassis with the cab and engine on the rear section and a telescopic boom at the front, combining benefits of an articulated wheeled loader and a telescopic handler. Advantages of the design include excellent manoeuvrability, reduced ground damage when working in sensitive areas, a large cab and excellent visibility. Disadvantages compared with a conventional telescopic handler include reduced lift height and reach due to the shorter boom, and a higher cab restricting use in low buildings. The range to date has included three models; the TM180, TM220
and the TM320 which is available in standard and higher performance S versions and accounts for most sales. Lift capacities are 1.8, 2.2 and 3.2t respectively. Almost all sold in the UK are to agricultural users.
Higher capacity “The trend is for larger farming units to require higher capacity,” explained JCB engineering manager responsible for the new TM420, Edward Owston. “But compact dimensions remain essential and we designed the new TM420 to carry 1t more but remain below 2.4m wide, and its cab is only 120mm higher than the TM320 despite the larger chassis, bigger boom and increased
Largest tyres available are 620/70R26. The articulated steering and good ground clearance was a benefit in slippery, wet clay.
diameter wheels.” Standard tyres are 480/80R26, replacing the TM320’s 460/70R24 and axles are upgraded including bigger hubs. The axles are borrowed from the 417 loading shovel but the engine and transmission are straight from the TM320S. TM320 updates in 2016 included a new cab, carried over to the TM420, having been developed for both models. The TM420 has a heavier duty chassis with large cast sections and no welding in stressed areas. Larger pins and bushes are fitted, and impregnated with graphite extending the lubrication interval to 500hrs, so greasing is required only
during routine servicing. Z-bar linkage is used on the TM320 but improved for the TM420, and a new attachment carriage has enclosed locking rams to protect against damage and corrosion when handling materials such as fertiliser and manure. The main hydraulic pump is the same as the TM320S at 160-litres/ min but added efficiency and much faster cycle times result from new oil circuits. Operating pressure is considerably higher so less effort is needed to lift a comparable load using the same hydraulic components. Regenerative hydraulics allow faster boom drop regardless of load and engine revs, improving efficiency of re-handling operations. Full height drop time (from fully extended to 5.4m) is approximately five seconds, even at low engine rpm, compared to the TM320 which takes around 10 seconds at full engine revs. Lift capacity on forks is up to 4.1t but the new hydraulics and z-bar design produce a tearout force of 7.2t, equivalent to a typical wheel loader of comparable size, and almost 1t above that of the TM320. This is particularly useful for heavy digging and handling manure from heaps; tasks for which TM models are ideal.
Comfortable and productive One of the main advantages of the articulated telescopic design is the spacious cab. Unlike telescopic handlers, which usually have the engine shoehorned in on one side of the full-length boom and the cab squeezed in on the other, the TM has plenty of room for a large cab across the full machine width. The raised cab gives a good view down the boom to the attachment and the open frame, articulated chassis means the operator can easily see both front wheels and any obstructions making it ideal for tight spaces. continued over...
Tearout force up to 7.20t is available. Lift capacity is 4.10t, maximum lift height is 5.45m and maximum reach is 3.05m.
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Farmers Guide Magazine June 2018 Issue