Develon Refines DX35Z-7 Mini Excavator for Confined-Site Work
Develon has reworked its four-tonne zero-tail-swing mini excavator with a new engine, altered boom geometry and faster arm movement, concentrating much of the engineering on visibility, hydraulic response and the everyday operation of the machine.
The upgraded DX35Z-7 uses Develon’s 18.4 kW DW01 Stage V diesel engine in place of the previous D17 unit. Operating weight is 4,040 kg, while the zero-tail-swing configuration suits construction, demolition, landscaping and utility work where the excavator frequently has to operate close to buildings, traffic, trenches or other equipment.
Beyond the engine change, Develon has revised the boom position and hydraulic plumbing, rearranged controls and opened up visibility from the cab. Maintenance access, cooling, transport tie-downs and attachment stability have also been addressed.
Briefing
- The upgraded DX35Z-7 weighs 4,040 kg and uses an 18.4 kW Develon DW01 Stage V diesel engine.
- The boom swing point has moved 75 mm to the right, with 60Β° swing available to either side.
- A larger 1/2-inch arm pipe increases arm-in speed by 3% and arm-out speed by 15%.
- Auxiliary hydraulic flow reaches 74 l/min, supported by an additional 100 kg counterweight.
- Maximum digging depth is 3,445 mm, with maximum digging reach of 5,400 mm.
Working Inside the Machine’s Footprint
Zero-tail-swing excavators earn their place where the machine has to dig without continually asking for more room around the counterweight. Roadside utilities, residential construction, landscaping, confined demolition and work alongside existing structures all favour an upper structure that remains substantially within the track footprint as it rotates.
Develon has retained that architecture while altering the front of the machine. The boom swing point has moved 75 mm to the right and the boom can now swing through 60Β° both left and right, giving the operator more flexibility when digging parallel with walls, kerbs, trenches and other obstacles.
Visibility changes extend to the windscreen. The wiper angle has increased from 60Β° to 89Β°, while the radio has been repositioned to improve the forward view. Boom swing operation has also moved from a pedal to a thumbwheel on the joystick, bringing another frequently used function onto the hand controls.
Hydraulic Response and Attachments
Develon has increased the arm pipe diameter from 3/8 inch to 1/2 inch, a relatively straightforward hydraulic change with a measurable effect on machine response. The company says arm-in speed increases by 3%, while arm-out speed rises by 15%, potentially shortening repetitive digging and loading cycles.
Auxiliary hydraulic flow is rated at 74 l/min for hydraulically powered attachments. Develon has paired this with an additional 100 kg counterweight to improve machine balance and stability when attachments add weight and leverage at the front of the excavator.
Digging performance remains substantial for a machine of this size. Maximum digging depth is 3,445 mm, reach is 5,400 mm and digging height is 5,215 mm. ISO digging force is listed at 3.24 tonnes at the bucket and 1.95 tonnes at the arm.
Cab Access and Operator Environment
The cab entrance has widened from 363 mm to 404 mm, accompanied by an increased stand tilting angle to make entry and exit easier. Develon has also changed the cooling arrangement from a suction-type system to a blower configuration, intended to improve engine heat dissipation and reduce heat around the seat.
A double-insulator arrangement reduces engine exhaust noise, while additional work lights have been fitted outside the cab. The machine also gains more tie-down points for securing it during transport, a practical detail for compact excavators regularly moving between sites.
Maintenance and Fleet Management
Access to the hydraulic oil filling point has been improved and a retractable cover added, while battery servicing now includes a jump-start feature. The air intake uses a two-stage cleaner with inner and outer filter elements, supported by a new clip arrangement designed to simplify filter replacement.
A monitoring and alarm system notifies operators when filter changes are required. The DX35Z-7 also connects to Develon Fleet Management, using data collected from onboard sensors to provide remote information about the machine and its operation.
For fleets spread across numerous smaller projects, telematics provides a way of keeping service requirements and machine utilisation visible without relying solely on information returned from individual sites.
Four-Tonne Working Envelope
The DX35Z-7 travels at 2.5 km/h in low range and 4.3 km/h in high range. Track shoes are 300 mm wide, rear swing radius is 940 mm and ground pressure is listed at 0.36 kg/cmΒ².
The upgrade does not depend on a dramatic increase in size or engine output. The DW01 remains an 18.4 kW engine, while much of the development has gone into how effectively the available machine can be used: faster arm movement, a revised boom position, better visibility, joystick boom-swing control, greater attachment stability, improved cooling and easier servicing.
It is a familiar pattern in mature compact equipment. Once the basic working envelope is established, useful development increasingly comes from refining the movements, controls and servicing tasks repeated throughout the working day.
Key Industry Questions
- What engine powers the upgraded Develon DX35Z-7?Β The machine uses a Develon DW01 Stage V diesel engine rated at 18.4 kW, or 25 hp, replacing the previous D17 engine.
- How much does the upgraded DX35Z-7 weigh?Β Operating weight is 4,040 kg.
- Is the DX35Z-7 a zero-tail-swing excavator?Β Yes. Its zero-tail-swing configuration allows the upper structure to rotate in confined working areas with minimal rear overhang.
- What is the maximum digging depth?Β Maximum digging depth is 3,445 mm, with maximum digging reach of 5,400 mm.
- What hydraulic flow is available for attachments?Β The machine provides auxiliary hydraulic flow of 74 l/min.
- How has arm speed changed?Β Increasing the arm pipe diameter from 3/8 inch to 1/2 inch raises arm-in speed by 3% and arm-out speed by 15%, according to Develon.
- What has changed in the boom swing arrangement?Β The boom swing point has moved 75 mm to the right and the boom now swings 60Β° to either side. Control has also moved from a foot pedal to a joystick thumbwheel.
- What changes have been made for transport?Β Develon has added more tie-down points to simplify securing the excavator during transport.
- Does the DX35Z-7 have telematics?Β Yes. Develon Fleet Management collects machine information from onboard sensors for remote fleet and equipment management.
Strategic Takeaways
- Faster hydraulic response has been achieved without increasing the machine’s headline 18.4 kW engine output.
- The 74 l/min auxiliary circuit and additional counterweight strengthen the machine’s capability when working with hydraulic attachments.
- Revised boom geometry, joystick control and improved forward visibility are particularly suited to confined utility and construction work.
- Maintenance access, cooling and transport changes target tasks that occupy time outside the digging cycle.
- The upgrade concentrates development on repeated operator interactions rather than pursuing a substantial increase in machine size or power.
