Excavators 5–6 t

Bobcat E55z vs Yanmar ViO57-6B

Bobcat E55z

Bobcat

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Yanmar ViO57-6B

Yanmar

Data: manufacturers and Bobcat's comparison tests. Does your experience say otherwise? Tell us ↓

Technical data

Parameter	Bobcat E55z	Yanmar ViO57-6B
Capacity and weight
Operating weight, standard / heavy configuration kg	5,421 / 5,650	5,485 / 5,680
Working range
Digging depth, standard / long arm mm	3,430 / 3,830	3,710 / 4,000
Dump height, standard / long arm mm	3,960 / 4,210	4,240 / 4,420
Reach at ground level, standard / long arm mm	5,840 / 6,230	5,950 / 6,230
Forces
Bucket breakout force kN	44.2	41.9
Arm breakout force, standard / long arm kN	31.0 / 26.3	24.4 / 22.2
Dimensions
Max. tail overhang, standard / heavy counterweight mm	20 / 91	0 / 75
Undercarriage width mm	1,960	1,990
Overall track length mm	2,566	2,590
Track width mm	400	400
Overall height mm	2,566	2,540
Engine
Engine	Bobcat D18, Stage V	Yanmar 4TNV86CT, Stage V
Engine power kW	36.5	34.5
In-cab noise dB(A)	75	80
Hydraulics
Hydraulic pump	variable piston pump, load sensing	variable piston pump, load sensing
Pump capacity l/min	138	139
Auxiliary flow l/min	80	82
Travel and slew
Travel speed low / high km/h	2.9 / 4.6	2.2 / 4.4
Boom swing left / right °	75 / 50	68 / 68

The table combines manufacturers' data and measurements from Bobcat's comparison tests (06-2021).

This comparison dates from 06-2021. A newer version of either machine may be on sale now, with different figures.

Machines with up to 5 cm of rear overhang count as zero tail swing: with the standard counterweight both are zero-tail machines, with the optional counterweight both become minimal-tail machines. The ViO57-6B replaced the ViO57-6; the change was the engine, from Stage IIIa to Stage V.

— means the manufacturer does not publish this figure.

What the table shows

Arm breakout force 31.0 / 24.4 kN (+27%) with the standard arm, 26.3 / 22.2 kN (+18%) with the long arm; bucket 44.2 / 41.9 kN.
First travel speed 2.9 / 2.2 km/h (+32%).
In-cab noise: 75 / 80 dB(A).
The ViO57-6B digs 280 mm deeper (3,710 / 3,430 mm) and dumps 280 mm higher with the standard arm; reach at ground level is practically equal.
Engine 36.5 / 34.5 kW; pump 138 / 139 l/min.

What it means on the job

Blade work at first speed

Driving 1 km while backfilling and levelling at first speed takes about 21 minutes with the E55z and 27 minutes with the ViO57-6B.

Calculation: 60 ÷ 2.9 km/h = 20.7 min; 60 ÷ 2.2 km/h = 27.3 min

A working day in the cab

80 dB(A) over an 8-hour day is the EU lower exposure action value: from that level the employer must offer hearing protection (Directive 2003/10/EC). The E55z cab measured 75 dB(A), the ViO57-6B 80 dB(A).

A trench in hard clay

With the standard arm the E55z curls in with 31.0 kN of arm force, the ViO57-6B with 24.4 kN.

Calculation: 31.0 ÷ 24.4 = 1.27

Closer look: notes from Bobcat's comparison test

Measurements and notes come from Bobcat's comparison tests (06-2021), in which both machines did the same jobs. These figures are not in the manufacturers' brochures. “Operator's opinion” is the personal impression of the operator who worked in the test: it is subjective, and your experience may differ.

Digging range and boom angle

Bobcat E55zBoom-up angle limited so that the bucket stays clear of the cab.

Yanmar ViO57-6BMore digging depth and dump height; the boom-up angle is not limited, so the bucket can come close to the cab.

Yanmar ViO57-6B — Boom fully raised — Boom fully raised

Blade and options

Bobcat E55zBlade float as standard. Hydraulic clamp and angle blade available as options.

Yanmar ViO57-6BNo blade float. Blade built from lighter sections; small lifting and tie-down holes that do not take large chain hooks. No hydraulic clamp or angle blade options.

Yanmar ViO57-6B — Blade and tie-down holes — Blade and tie-down holes

Cab entry and space

Bobcat E55zWide door opening with a step; roomy cab with space between the consoles.

Bobcat E55z — Door opening — Door opening

Yanmar ViO57-6BNarrow door opening and a trip hazard at the entry; limited space between the consoles.

Yanmar ViO57-6B — Door opening — Door opening

Yanmar ViO57-6B — Space between consoles — Space between consoles

Controls and display

Bobcat E55zKey start as standard, keypad or keyless start as options. Boom swing controlled proportionally with a switch. 5" display as standard, 7" touch display with camera as an option.

Yanmar ViO57-6BKey start only. Boom swing with a foot pedal. Small display without camera support or jog control.

Visibility

Bobcat E55zLower right window and narrow cab posts.

Yanmar ViO57-6BWide cab posts, the door panel and no lower right window limit the side view.

Swing frame, tie-downs and track tension

Bobcat E55zSwing frame within the track width. Eight tie-down points. Cab door protected in the open position. Automatic track tensioning as an option.

Yanmar ViO57-6BSwing frame outside the track width. Four tie-down points. Cab door exposed in the open position. No automatic track tensioning.