ZF 9055
TECHNICAL DATA SHEET
ZF 9000 SERIES
PRODUCT DETAILS
Description
3 shaft, reverse reduction transmission with hydraulic clutch mounted on the input shaft and another one mounted on
the reverse shaft. Input drive on opposite side to output drive.
Non-reversing NR version also available
Fully works tested, reliable and simple to install
Suitable for high performance applications in all types of fast craft, luxury motoryachts, patrol vessels, crew-boats etc
Compatible with all types of engines and propulsion systems, including waterjets and surface-piercing propellers and
cpp’s
Compact, space-saving design, complete with oil cooler, pump and full flow filter.
Design, manufacture and quality control standards comply with ISO 9001
Features
Lightweight and robust aluminum alloy casing (sea water resistant)
Case hardened and precisely ground gear teeth for long life and smooth running
Output shaft thrust bearing designed to take maximum propeller thrust astern and ahead
Smooth and reliable hydraulic shifting with electric actuation
Emergency "get home" capability
Suitable for twin engine installation (same ratio and torque capacity enginewise or counter-enginewise)
Airborn and structure born noise in accordance to ISO 8579
ZF 9055
RATINGS
Ratios Power Factor Input Power Capacity Max. Max. Max.
kW/RPM hp/RPM kW hp kW hp kW hp kW hp RPM
Pleasure Duty - Diesel 1800 RPM 2000 RPM 2100 RPM
1.186*, 1.515*, 1.576*, 1.742*, 2.036, 1.7595 2.3595 3167 4247 3519 4719 3694 4953 3694 4953 2300
2.269*, 2.400*, 2.542, 2.739*, 2.957
3.250* 1.6571 2.2222 2983 4000 3314 4444 3479 4665 3479 4665 2300
3.360* 1.6190 2.1711 2914 3908 3238 4342 3399 4558 3399 4558 2300
3.448* 1.5833 2.1232 2850 3822 3167 4246 3324 4457 3324 4457 2300
Light Duty - Diesel 1800 RPM 2000 RPM 2100 RPM
1.186*, 1.515*, 1.576*, 1.742*, 2.036, 1.7381 2.3308 3129 4195 3476 4662 3650 4894 3650 4894 2300
2.269*, 2.400*, 2.542, 2.739*, 2.957
3.250* 1.6381 2.1967 2949 3954 3276 4393 3440 4613 3440 4613 2300
3.360* 1.5976 2.1424 2876 3856 3195 4285 3354 4497 3354 4497 2300
3.448* 1.5652 2.0990 2817 3778 3130 4198 3286 4406 3286 4406 2300
Medium Duty - Diesel 1600 RPM 1800 RPM 2000 RPM
1.186*, 1.515*, 1.576*, 1.742*, 2.036, 1.6600 2.2261 2656 3562 2988 4007 3320 4452 3320 4452 2300
2.269*, 2.400*, 2.542, 2.739*, 2.957
3.250* 1.5050 2.0182 2408 3229 2709 3633 3010 4036 3010 4036 2300
3.360* 1.4550 1.9512 2328 3122 2619 3512 2910 3902 2910 3902 2300
3.448* 1.4170 1.9002 2267 3040 2551 3420 2834 3800 2834 3800 2300
* Special Order Ratio
Timestamp: 17.09.2019 02:00:33 - Technical Data Sheet - ZF 9055 2
ZF 9055
DIMENSIONS
A B1 B2 H1 H2 L L1 L2
Millimeter (mm)
390.0 545.0 545.0 405.0 800.0 897.0 640.0 164.0
Inch (in)
15.35 21.46 21.46 15.94 31.5 35.31 25.2 6.46
Weight (kg) Weight (lb) Amount of Oil (l) Amount of Oil (qt)
1400 3086 80.0 84.8
BELL HOUSING DIMENSIONS
Bolt Holes
A B C L3
Name Diameter
No.
mm in mm in mm in mm in mm in
SAE 00 787.4 31.0 850.9 33.5 882.65 34.75 280.0 11.02 16 13.49 0.53
OUTPUT FLANGE DIMENSIONS
Bolt Holes
A B C D
Diameter (E)
No.
mm in mm in mm in mm in mm in
350.0 13.78 310.0 12.2 220.0 8.66 35.0 1.38 18 24.2 0.95
Timestamp: 17.09.2019 02:00:33 - Technical Data Sheet - ZF 9055 3
GENERAL INFORMATION
Duty Definitions
Pleasure Duty
Highly intermittent operation with very large variations in engine speed and power.
500 hours/year
Average engine operating hours limit:
300 hours/year for mechanical gearboxes
Typical hull forms: Planing
Applications: Private, non-commercial, non-charter leisure activities, no racing
Light Duty
Intermittent operation with large variations in engine speed and power.
2500 hours/year
Average engine operating hours limit:
(for hydraulic transmissions smaller than ZF 2000 series, 2000 hours/year)
Typical hull forms: Planing and semi-displacement
Typical applications: Private and charter, sport/leisure activities, naval and police activities
Medium Duty
Intermittent operation with some variations in engine speed and power.
4000 hours/year
Average engine operating hours limit: (for hydraulic transmissions smaller than ZF 2000 series and workboat ZF W2700 series, 3500
hours/year)
Typical hull forms: Semi-displacement and displacement
Typical applications: Charter and commercial craft (example: crew boats), and naval and police activities
Continuous Duty
Continuous operation with little or no variations in engine speed and power.
Average engine operating hours limit: Unlimited
Typical hull forms: Displacement
Typical applications: Heavy duty commercial vessels
Technical Notes
Duty Ratings
Ratings apply to marine diesel engines at the indicated speeds. At other engine speeds, the respective power capacity (kW) of the
transmission can be obtained by multiplying the Power/Speed ratio by the speed. Approximate conversion factors:
1 kW = 1.36 metric hp
1 kW = 1.34 U.S. hp (SAE)
1 U.S. hp = 1.014 metric hp
1 Nm = 0.74 lb.ft.
1 Kg = 0.454 lb
Ratings apply to right hand turning engines, i.e. engines having counterclockwise rotating flywheels when viewing the flywheel end of the
engine. These ratings allow full power through forward and reverse gear trains, unless otherwise stated. Contact your nearest ZF Sales and
Service office for ratings applicable to gas turbines, as well as left hand turning engines, and marine transmissions for large horsepower
capacity engines. Ratings apply to marine transmissions currently in production or in development and are subject to change without prior
notice.
NOTE: The maximum rated input power must not be exceeded (see respective ratings in the technical data sheets).
Safe Operating Notice
The safe operation of ZF products depends upon adherence to technical data presented in our brochures. Safe operation also depends upon
proper installation, operation and routine maintenance and inspection under prevailing conditions and recommendations set forth by ZF.
Damage to transmission caused by repeated or continous emergency manoeuvres or abnormal operation is not covered under warranty. It is
the responsibility of users and not ZF to provide and install guards and safety devices, which may be required by recognized safety standards
of the respective country (e.g. for U.S.A. - the Occupational Safety Act of 1970 and its subsequent provisions).
Monitoring Notice
The safe operation of ZF products depends upon adherence to ZF monitoring recommendations presented in our operating manuals, etc. It is
the responsibility of users and not ZF to provide and install monitoring devices and safety interlock systems as may be deemed prudent by ZF.
Consult ZF for details and recommendations.
Survey Society Classification
In most cases, the maximum medium and continous duty ratings permitted by ZF are accepted in full by major classification societies. If
classification is required, contact ZF regarding proper procedures (also for yacht service and ice classifications service).
Dimensions and Weights
Dimensions and weights refer to transmissions with bell housing (where appropriate) but excluding options such as: trolling valves, power
take-offs, propeller shaft companion flanges, torsional couplings etc.
Torsional Vibration and Torsional Couplings
The responsibility for ensuring torsional vibration compatibility rests with the overall propulsion system integration responsible party.
Compatibility check of torsional vibration must include excitations induced by engine governor. ZF cannot accept any liability for gearbox noise
or for damage to the gearbox, the flexible coupling or to other parts of the drive unit caused by torsional vibrations. Contact ZF for further
information and assistance.
For single engine powered boats, where loss of propulsion can result in loss of control, ZF recommends the use of a torsional limit stop. It is
the buyer's responsibility to specify this option. ZF cannot accept any liability for personal injury, loss of life or damage or loss of property due
to the failure of the buyer to specify a torsional limit stop.
ZF selects torsional couplings on the basis of nominal input torque at commonly rated engine speeds. Consult ZF for details concerning speed
limits of standard offered torsional couplings, which can be below transmission limits. Special torsional couplings may be required for Survey
Society requirements.
Timestamp: 17.09.2019 02:00:33 - Technical Data Sheet - ZF 9055 4
