Ram-Type Steering Gear
critical
IMO Required
Hydraulic ram (piston) type steering gear for larger vessels
4000h
Service Interval
5 yr
Class Survey
30 yr
Typical Lifetime
Typical Manufacturers
Kawasaki
MacTaggart Scott
Known Models (3)
Kawasaki KR-150
1500 kNm torque
· 55.0 kW
· Hydraulic oil
Common Failures:
- • Ram seal leakage
- • Tiller pin wear
- • Hydraulic pipe fracture
- • Relief valve malfunction
Service: 4-ram Rapson slide type; check tiller pin clearance at class survey.
Spares: Kawasaki: Dichtungssatz und Magnetventile an Bord vorhalten. Lead time: 3-8 Wochen.
Kawasaki KR-80
800 kNm torque
· 30.0 kW
· Hydraulic oil
Common Failures:
- • Ram seal wear
- • Crosshead bearing wear
- • Oil level drop from internal leak
Service: 2-ram type for smaller vessels; test both power units independently.
Spares: Kawasaki: Dichtungssatz und Magnetventile an Bord vorhalten. Lead time: 3-8 Wochen.
MacTaggart Scott DE-Val 300
3000 kNm torque
· 75.0 kW
· Hydraulic oil
Common Failures:
- • Cylinder seal failure
- • Rapson slide wear
- • Piping fatigue crack
- • Pump unit failure
Service: Large tanker/bulker steering; redundant pump system mandatory.
Spares: MacTaggart Scott: Dichtungssatz und Magnetventile an Bord vorhalten. Lead time: 3-8 Wochen.