Instruction manual
20220109E
5
1
GENERAL
HLD350 MK2 and HLD2000 MK2 are hydraulic linear drives
designed for boats with mechanical steering systems such as wire and
cable steering (Edson, Whitlock, Teleflex).
The HLD is a compact, assembled unit, consisting of a reversible
hydraulic pump, a balanced hydraulic cylinder, by-pass valve and oil
tank.
Because of the direct connection to the rudder, the hydraulic linear
drive can be used even if the hand steering should fail. This can be an
important safety factor.
The by-pass valve makes it possible to use the helm with little back
drive force when the autopilot is switched off.
The HLD350 MK2 and HLD2000 MK2L supersede the previous
HLD350 and HLD2000L models. This manual also includes
HLD2000 MK2D. This model is based on the same main parts as
HLD350 MK2, but uses the HLD2000 MK2LD motor.
The MK2 versions were introduced in April 1998. The cylinder has a
slightly increased diameter and requires a modified piston assembly
and piston sealing. Otherwise the MK2 versions are identical to the
previous HLD350 and HLD2000L. The modified units have got a MK2
added to the type designation on the product label and applies from the
following serial numbers and onwards.
The basic specifications are:
Art. no. Ser. no. Description
21113303 545H36 HLD350 MK2 (200 mm stroke)
21113311 545H36 HLD350 MK2S (split version)
21113360 4154H69 HLD2000 MK2L (long version, 340 mm
stroke)
21113386 4154H610 HLD2000 MK2LS (long, split version)
21113345 3383H68 HLD2000 MK2D (dual cylinder version,
200
mm
stroke)
21113402 4154H611 HLD2000 MK2LD (long dual cylinder
version)
In this manual HLD is used as a general term for all models. The MK2
designation is added only when specifically required for parts
identifications.
All HLD models are supplied with environmentally friendly synthetic
hydraulic oil with designation of type Hydralen 32 (viscosity 32 cSt).
This oil can without problem substitute/blend with ordinary hydraulic
oil with equivalent viscosity (between 15 and 40 cSt)
