ZF 3055 A

TECHNICAL DATA SHEET

ZF 3000 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)
 "SUPERSHIFT" clutch control
ZF 3055 A

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 2100 RPM 2300 RPM 2450 RPM
1.351*, 1.486*, 1.750*, 2.034, 0.6489 0.8702 1363 1827 1492 2001 1589 2130 1589 2130 2600
2.259*, 2.520, 2.750*, 3.000*
3.280* 0.5841 0.7833 1227 1645 1343 1802 1431 1919 1431 1919 2600
3.444* 0.5451 0.7310 1145 1535 1254 1681 1254 1681 1254 1681 2600
Light Duty - Diesel 2100 RPM 2300 RPM 2450 RPM
1.351*, 1.486*, 1.750*, 2.034, 0.5847 0.7841 1228 1647 1345 1803 1432 1920 1432 1920 2600
2.259*, 2.520, 2.750*, 3.000*
3.280* 0.5354 0.7180 1124 1508 1231 1651 1311 1758 1311 1758 2600
Medium Duty - Diesel 1800 RPM 2100 RPM 2250 RPM
1.351*, 1.486*, 1.750*, 2.034, 0.5508 0.7386 991 1329 1157 1551 1239 1661 1239 1661 2600
2.259*, 2.520, 2.750*
3.000* 0.5331 0.7149 960 1287 1120 1501 1199 1607 1199 1607 2600
3.280* 0.4552 0.6104 819 1099 956 1282 1024 1373 1024 1373 2600
3.444* 0.3998 0.5361 720 965 840 1126 840 1126 840 1126 2600
* Special Order Ratio

Timestamp: 22.04.2021 14:27:30 - Technical Data Sheet - ZF 3055 A 2

ZF 3055 A

DIMENSIONS

A B1 B2 H1 H2 L L1 L2
Millimeter (mm)
326.8 365.0 365.0 218.2 664.8 668.0 452.0 132.0
Inch (in)
12.87 14.37 14.37 8.59 26.17 26.3 17.8 5.2
Angle (°) Weight (kg) Weight (lb) Amount of Oil (l) Amount of Oil (qt)
10 490 1080 31.0 32.9

BELL HOUSING DIMENSIONS

Bolt Holes
A B C L3
Name Diameter
No.
mm in mm in mm in mm in mm in
SAE 0 647.7 25.5 679.45 26.75 711.2 28.0 150.0 5.91 16 13.49 0.53
SAE 1 511.2 20.13 530.2 20.87 554.0 21.81 150.0 5.91 12 12.0 0.47

OUTPUT FLANGE DIMENSIONS

Bolt Holes
A B C D
Diameter (E)
No.
mm in mm in mm in mm in mm in
225.0 8.86 190.0 7.48 145.0 5.71 25.0 0.98 12 22.2 0.87

Timestamp: 22.04.2021 14:27:30 - Technical Data Sheet - ZF 3055 A 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: 22.04.2021 14:27:30 - Technical Data Sheet - ZF 3055 A 4