Güde GMH 603 Petrol Hedge Trimmer – 2-stroke 0.75 kW engine and 770 mm dual blade
The Güde GMH 603 is a petrol hedge trimmer for semi-professional use, featuring a 0.75 kW (26 cm³) OHV 2-stroke engine, a 770 mm bidirectional dual blade (615 mm effective cutting length), cutting capacity for branches up to 27 mm thick, and a 180° swivel handle. Manufactured in Germany by Güde. Distributed by Krollit, official Güde distributor since 2007.
- Engine: 0.75 kW (26 cm³) OHV 2-stroke
- Engine speed: 10,000 rpm
- Fuel: 40:1 petrol mixture, 0.46 L tank
- Reversible manual start (right and left-hand starting)
- Bidirectional dual blade: 770 mm with 615 mm effective cutting length
- Maximum branch thickness: 27 mm
- 180° swivel handle for horizontal and vertical cutting
- 3-point anti-vibration system
- Overall length: 1,195 mm
- Weight: 6 kg net, 7.7 kg gross
- Noise level LWA: 109 dB(A)
- 24-month warranty, Made in Germany
Who uses the GMH 603 and for what
The GMH 603 is chosen by villa and garden owners with medium residential hedges, landscape maintenance professionals managing seasonal cycles for multiple private clients, and professional gardeners working on hedges 1–2 m high and up to 1 m wide. The 770 mm bidirectional dual blade cuts on both push and pull strokes and covers most ornamental hedges for branches up to 27 mm thick. The 180° swivel handle allows switching from horizontal top-cutting to vertical side-cutting without changing the operator's position, reducing shoulder and neck fatigue during continuous work sessions. In the Krollit catalog, the GMH 603 sits between manual shears (limited to branches under 15 mm) and a light chainsaw (oversized for hedges).
Krollit logistics and support
Shipping 5-9 business days (7 days for southern regions). Technical assistance in Italian available for the entire product life at +39 0825-1494022. Original Güde spare parts (blade, spark plug, air filter, 40:1 2-stroke mixture kit) available from Krollit warehouse, Monteforte Irpino (AV).
Who the GMH 603 is for
| Profile |
Compatibility |
Reason |
| Villa or garden owner with medium hedges (1–2 m) |
Suitable |
770 mm blade, 6 kg weight, and 180° swivel handle cover seasonal residential hedge trimming; initial investment and routine maintenance (mixture, spark plug, air filter) are lower compared to a battery hedge trimmer of comparable power. |
| Professional gardener and landscape maintenance professional |
Suitable |
The 615 mm effective cutting length quickly covers medium hedges; the 0.46 L tank allows multiple hedges to be completed before refueling; reversible starting (right and left-hand) suits both right-handed and left-handed operators. |
| Operator with continuous work shifts exceeding 3 hours per day |
Adequate |
The 0.75 kW engine and 0.46 L tank are sized for intermittent seasonal use; for hedges over 2.5 m high, a model with an extendable pole is preferable; for cycles with more than 5 medium hedges per shift, a battery solution reduces refueling breaks. |
Not suitable for: hedges over 3 m high or over 1.5 m wide (770 mm blade and non-extendable pole configuration do not cover these cases), branches over 27 mm thick, continuous professional work over 40 hours per week (machine sized for intermittent seasonal use), residential areas subject to acoustic emission limits during protected hours (noise level 109 dB(A)).
Engine and power supply
| Engine type |
2-stroke OHV (Over Head Valve) |
| Engine power |
0.75 kW (1 HP) |
| Displacement |
26 cm³ |
| Engine speed |
10,000 rpm |
| Fuel |
40:1 petrol mixture (1 part synthetic 2-stroke oil, 40 parts 95+ octane unleaded petrol) |
| Tank capacity |
0.46 L |
| Start-up |
Reversible manual (right and left-hand) |
| Engine shutdown |
On/off switch on throttle lever |
| Fuel pump |
Integrated manual (primer for starting) |
Cutting blade
| Blade type |
Bidirectional oscillating dual blade |
| Blade length |
770 mm |
| Effective cutting length |
615 mm |
| Maximum branch thickness |
27 mm |
| Blade protection |
Manual right-hand protection and integrated upper protection |
Construction and comfort
| Handle |
180° swivel for horizontal and vertical cutting |
| Anti-vibration system |
3-point support |
| Reversible starting |
Yes, for right-handed and left-handed operators |
| Overall length |
1,195 mm |
| Width |
240 mm |
| Height |
240 mm |
Dimensions and weight
| Net weight |
6 kg |
| Gross weight (with packaging) |
7.7 kg |
Acoustic and environmental performance
| Sound power (LWA) |
109 dB(A) |
| CO2 emissions |
1,237 g/kWh |
| Emissions compliance |
Euro 5 |
| Fuel compatibility |
E10 (petrol with up to 10% bioethanol) |
Compliance and warranty
| CE marking |
Yes, Machinery Directive 2006/42/EC |
| Applied standards |
EN 60745-1, EN 60745-15, EN 61000 |
| Güde quality certification |
Q9 |
| Warranty |
24 months from date of purchase |
| Country of production |
Germany |
Standard equipment
- Güde GMH 603 hedge trimmer assembled and ready for use
- 770 mm dual blade mounted and sharpened
- Integrated 3-point anti-vibration system
- Manual fuel pump (primer)
- Spare spark plug
- Spark plug wrench and maintenance wrench
- User manual in Italian and German
- Technical sheet with maintenance instructions
- CE Declaration of Conformity
Frequently Asked Questions
What is the difference between a dual blade and a single blade on a hedge trimmer?
A bidirectional dual blade cuts on both push and pull strokes because the oscillating movement moves both sides of the blades. A single blade cuts in only one direction and requires a higher engine advance speed to achieve the same result.
On the GMH 603, the dual blade allows for smoother cutting with less operator effort, a useful condition for the 1–2 hour sessions typical of residential hedge maintenance. The disadvantage is a slightly higher blade assembly weight compared to a single-blade model of the same length, already included in the declared total weight of 6 kg.
Is the 40:1 mixture the same as for other Güde 2-stroke tools?
Yes. The 40:1 mixture (1 part synthetic 2-stroke engine oil, 40 parts 95+ octane unleaded petrol) is the Güde standard for 2-stroke tools. If you have other Güde 2-stroke tools (brush cutters, chainsaws), you can use the same mixture for your entire fleet.
Krollit supplies pre-packaged Güde 2-stroke oil bottles for quick and accurate mixture dosing. For DIY dosing, a graduated tank and a measuring cup are recommended to ensure the 1:40 ratio is respected for the entire tank volume (0.46 L). A mixture that is too lean in oil will damage the engine within a few hours of operation.
Can I sharpen the blade myself or do I need to take it for service?
Manual blade sharpening is possible with a specific file for hedge trimmer teeth. The procedure involves disassembling the blade, clamping it to a workbench, and sharpening each tooth at a 30°–40° angle to the blade plane. The Güde manual provides step-by-step instructions. The recommended interval is every 50 hours of actual use.
If in doubt about the procedure or if the blade is particularly worn, it is advisable to contact an authorized Güde service center, which performs professional sharpening and tooth realignment. Krollit handles sharpening and blade replacement requests through customer service at +39 0825-1494022.
How does the 180° swivel handle work in practice?
The rear handle rotates 180° around its axis, with mechanical locking in intermediate positions. It allows the blade to be oriented horizontally for cutting the top of a hedge and vertically for cutting the sides, without changing the operator's leg and torso position.
The operational advantage is a reduction in shoulder and neck rotation when switching between top and sides, which on hedges longer than 5–10 linear meters becomes a source of fatigue if the machine has a fixed handle. The lock maintains the chosen position for the entire duration of the cut.
Does the 109 dB(A) noise require hearing protection?
Yes. The declared sound power value LWA is 109 dB(A), exceeding the 80 dB equivalent exposure threshold that workplace safety regulations indicate as a reference for noise risk assessment. It is advisable to use earmuffs or earplugs with an SNR attenuation of at least 25 dB during use.
For work in residential areas, the acoustic emissions of a 2-stroke engine make it appropriate to limit use to the time slots allowed by municipal regulations (typically weekdays 7:00 AM–7:00 PM, with possible midday breaks stipulated by specific regulations). Verification of permitted hours for motorized tools should be done according to the urban police regulations of the municipality of intervention.
How much autonomy does the 0.46 L tank provide?
Autonomy with a full tank of mixture varies depending on the hedge density, acceleration regime, and branch thickness. On soft hedges (boxwood, privet), consumption is lower than on hard hedges or branches close to the maximum 27 mm thickness.
The reversible start and manual fuel pump allow for quick refilling and restart between hedges. For an accurate estimate for your specific work cycle, Krollit technical assistance is available at +39 0825-1494022 and provides consumption data consistent with the type of hedge to be managed.
Can I also use the GMH 603 for ornamental shrubs and shape pruning?
Yes. The 770 mm blade with an effective cutting length of 615 mm and a maximum branch thickness of 27 mm covers most ornamental shrubs and shape pruning on garden plants. The 180° swivel handle is useful for finishing shapes on spheres, cones, and shaped hedges.
For branches exceeding 27 mm in thickness, it is advisable to use a pruning saw or a dedicated pruning chainsaw. The GMH 603 is sized for cutting flexible branches of limited section, not for cutting trunks or mature woody branches.
How is winter maintenance performed on the GMH 603?
At the end of the season: empty the fuel tank (or add fuel stabilizer if storage exceeds 1 month), remove the spark plug, and clean the air filter. Clean the blade of plant debris and lightly grease it to prevent oxidation during winter.
At the beginning of the next season: fill the tank with fresh 40:1 mixture, check the spark plug condition (replace it with the provided spare if necessary), operate the manual fuel pump 10–20 times to pre-prime the fuel line, and attempt to start. If the engine has been idle for more than 2 months, the pre-priming procedure with the manual pump avoids dry starts and starter motor wear.
