Hitachi ZAXIS-7 ultrashort tail-swing excavators allow operators to complete work in congested urban environments. The reduced tail swing supports jobsite maneuverability and versatility.
“As the number of urban projects continues to increase, there is clear demand among operators for larger reduced-tail-swing excavators. These excavators can work in congested areas while keeping lanes open on road projects,” said Patrick Baker, product manager, medium and large excavators, Hitachi Construction Machinery Americas Inc.
Hitachi offers several ZAXIS-7 ultrashort tail-swing excavator models tailored to meet this demand. The Hitachi ZX135US-7 excavator weighs in at 31,973-lbs. (14,500 kg), has a 19-ft., 7-in. (5.98-m) maximum dig depth and a bucket breakout force of 23,380-lbs. (104 kN). The 56,669-lb. (25,700-kg) Hitachi ZX245USLC-7 excavator features a maximum dig depth of 21-ft., 8-in. (6.61 m) and a bucket breakout force of 35,520-lbs. (158 kN). The ZX345USLC-7 excavator has a 76,955-lb. (34,900-kg) operating weight, a maximum dig depth of 24-ft., 10-in. (7.57 m) and a bucket breakout force of 45,411-lbs. (202 kN).
The hydraulic system on the ZAXIS-7 excavators allows performance on worksites. The ZX135US-7 includes HIOS IV technology that has a responsive boom, arm and bucket. The ZX245USLC-7 uses next-generation TRIAS III technology that provides quick response to all control inputs. The ZX345USLC-7 relies on proven TRIAS II technology that supports use of available power.
The ZX245USLC-7 features a new arm roll-in metering control valve that allows hydraulic pump power to be reduced when the arm is operated with a low load. When digging, the roll-in metering control valve reduces hydraulic pressure loss to the tank. This decreases the pump power needed for digging operations.
The ZX245USLC-7 and ZX345USLC-7 allow attachment or arm priority to be adjusted on the monitor to match the attachment or the operator’s preference. When the attachment and arm are operated at the same time, the operator can adjust whether the speed of the attachment or the arm should be prioritized. The operator can also adjust boom raise priority using the monitor. This can tailor the machine for everything from truck loading to heavy digging.
Isuzu engines power all three models, producing 100-net-hp (74.9 kW) for the ZX135US-7, 164-net-hp (122 kW) for the ZX245USLC-7 and 249-net-hp (186 kW) for the ZX345USLC-7. Economy, power and high-performance modes match available power to the working conditions while an auto idle system with auto shut-down control prevents wasted fuel.
Cab and Visibility
The excavators have a large cab with head clearance. A one-touch adjustable air suspension seat is synchronized to move with the console. Noise has been minimized by increasing the thickness of the rear glass. Improved airtightness of the cab helps keep the dust out, even when the air conditioner is started.
Cab mounts reduce vibration when traveling. An 8-in. (20.32-cm) anti-glare LCD monitor is available which controls the Bluetooth radio. The operator can listen to music and make a hands-free call from the cab. LED lights provide visibility in challenging conditions. Switches have been collectively installed on the right side with access to those frequently used. The Aerial Angle peripheral vision camera system provides a wide 270-degree bird’s-eye view of the machine’s immediate environment. The operator can select a view on the monitor that suits the situation. A rear-view camera allows the operator to see the area right below the counterweight.
The ZAXIS-7 excavators feature enhancements on various components such as the undercarriage and boom. On the undercarriage, the lower roller design helps prevent mud compaction, protecting oil seals. The upper and lower rollers also feature idler sealing. The ZAXIS-7 excavators have a strengthened boom end and foot. For durability, the bushings are installed in the brackets at the boom end and the boom foot.
Tracking maintenance is simplified with the multifunctional monitor. It indicates preset maintenance intervals each time the key is turned on. Engine oil and coolant levels can be checked right from the operator’s seat.
Design enhancements help protect components from the environment. An inner element of the engine air filter protects the engine from dust ingress while cleaning the outer element. The air conditioner is protected with an internal filter with a seal that prevents dust from entering the air conditioner unit.
Using telematic tools to monitor machine health support operations. “ConSite now actively checks engine and hydraulic oil, along with other parameters, so operators can see a problem before its even a fault code. This increases customer uptime,” notes Baker.
ConSite OIL is standard on the ZX245USLC-7 and ZX345USLC-7 and an option on the ZX135US-7. It monitors engine and hydraulic oil conditions to catch issues before any fault codes are triggered in the machine. This helps drive operations by catching oil degradation before damage to critical systems can occur.
Consite Air allows the excavator to be diagnosed remotely, as well as remote updates of the software. The servicing dealer can remotely diagnose issues that may arise. A ConSite response team is on standby to rapidly resolves issues as they emerge.