14
020105.03
Hydraulic Steering Systems 30 - 175 kgm
5
Maintenance
- Check the oil level in the top steering pump regularly. When the
installation includes an extra oil expansion tank, the oil level
should be halfway up this tank.
- Check regularly to ensure that the steering pump shaft and cyl-
inder piston rod are not dirty; clean when necessary to prevent
damage to the oil seal.
- Clean the piston rod regularly (with fresh water after sailing on salt
water) and lubricate with a corrosion-resistant oil (not grease).
- At regular intervals, lubricate at the cylinder side both the pivots
of cylinder support and clevis.
- Drain and replace the hydraulic oil once every 3 years, or after
every 300 operating hours.
Tubing
Steering pump
HTP20(R)
HTP30(R)
HTP42(R)
Cylinder
MTC30
nylon tubing
6 mm I.D., 8 mm O.D. *
MTC52
nylon hose
6 mm I.D., 10 mm O.D. *
or
soft annealed red copper/ steel tubing
8 mm I.D., 10 mm O.D. **
MTC72
MTC125
MTC175
* Maximum length,
tube/ hose 6 mm I.D.
41 m (134 ft)
28 m (91 ft)
20 m (65 ft)
** Maximum length,
tube/ hose 8 mm I.D.
100 m (328 ft)
67 m (220 ft)
48 m (157 ft)
No. of turns steering wheel H.O. to H.O.
Steering pump
HTP20(R)
HTP30(R)
HTP42(R)
Cylinder
MTC30
3,4
2,3
–
MTC52
5,3
3,5
2,5
MTC72
7,5
4,9
3,5
MTC125
–
8,5
6,1
MTC175
–
–
8,5
Hydraulic fluid
Hydraulic oil
: In accordance with ISO VG 15
Viscosity
: 14 cSt at 40°C
Viscosity index
: Greater dan 380
Solidifying point
: Below -60°C
The following hydraulic oils fulfil the above specifications:
VETUS
: Hydraulic oil HF15
Shell
: Aeroshell Fluid 4
Chevron Texaco
: Aircraft Hydraulic 5606G
Esso
: Univis HVI 13
Exxon Mobil
: Mobil Aero HFA
