International, Inc. Heat Pump User Manual

Installation

20220422N 19

• Use the fingers and turn clockwise until a noticeable

increase in torque is required.

• Tighten further by 30 degrees (= 1/12 of a turn) using

necessary force (25-30 Nm/230-260 In.Ibs).

Pumps with new fittings have got new serial no. code and is

valid from the following s.no’s; RPU80: s.n. 2460 H06,

RPU160: s.n. 1560 H14, RPU300: s.n. 380 H28, RPU300, 24V:

s.n. 180 H29

Installation of pipes

Drain the oil from the steering gear by loosening the rudder

cylinder couplings. At a convenient point cut the pipes and

mount a T-coupling to each pipe. Cutting ring couplings of an

appropriate diameter should be used. Ensure that the pipe is cut

at a right angle as otherwise the ultimate tightness of the

coupling may be adversely affected. It is preferable to use pipe

cutting tool for this operation.

Note ! It is very important to remove ALL traces of metal filings and

other impurities from the pipes after cutting.

Figure 4-1 Figure 4-2 Figure 4-3

Figure 4-1, 4-2 and 4-3 show the parts that form a cutting ring

coupling. It is important to note which way the cutting ring is

fitted, the following procedure should be followed:

a) Nut and cutting ring are slid over the pipe, figure 4-1.

b) A few drops of oil are first applied to the threads of the

coupling. The pipe is then inserted fully into the coupling and

held whilst the nut is tightened by hand until the cutting ring

rests against the cone (figure 4-2).

c) The nut is now tightened 1½ - 2 turns until the cutting ring

cuts into the pipe surface (figure 4-3). Ensure that the pipe is

held firmly in place whilst the nut is tightened. Release the

coupling and check that the cutting ring has successfully cut

into the pipe.