Ram-Type Steering Gear
critical
IMO Required
12 models total
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
4 manufacturers · 12 models
MacGregor
5
Hatlapa HRP-100
unverified
Series
HRP
Type
ram_type
Hatlapa HRP-200
unverified
Series
HRP
Type
ram_type
Hatlapa HRP-300
unverified
Series
HRP
Type
ram_type
Hatlapa HRP-400
unverified
Series
HRP
Type
ram_type
Hatlapa HRP-600
unverified
Series
HRP
Type
ram_type
Kongsberg
4Kawasaki
2
KR-150
1500 kNm torque
· 55.0 kW
· Hydraulic oil
Common Failures & Inspection Points
- 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.
Spare Parts: Kawasaki: Dichtungssatz und Magnetventile an Bord vorhalten. Lead time: 3-8 Wochen.
KR-80
800 kNm torque
· 30.0 kW
· Hydraulic oil
Common Failures & Inspection Points
- Ram seal wear
- Crosshead bearing wear
- Oil level drop from internal leak
Service: 2-ram type for smaller vessels; test both power units independently.
Spare Parts: Kawasaki: Dichtungssatz und Magnetventile an Bord vorhalten. Lead time: 3-8 Wochen.
MacTaggart Scott
1
DE-Val 300
3000 kNm torque
· 75.0 kW
· Hydraulic oil
Common Failures & Inspection Points
- Cylinder seal failure
- Rapson slide wear
- Piping fatigue crack
- Pump unit failure
Service: Large tanker/bulker steering; redundant pump system mandatory.
Spare Parts: MacTaggart Scott: Dichtungssatz und Magnetventile an Bord vorhalten. Lead time: 3-8 Wochen.