Volvo Penta TMD22 Wartungshandbuch PDF herunterladen (Seite 84)

Lubrication system

Relief valve, replacement

(18A-08)

The relief valve is installed on the left side of the

pump and can be replaced as a unit. The pressure

setting cannot be adjusted in any other way than by

installing new components.

Bend the shafts of the split pin together (A1). Press

the end plug (A4) and remove the split pin from the

pump housing.

Take the weight off the plug and if possible remove

the plug and the spring (A3). If the plug will not

come loose, tap it carefully inwards to see if the

spring tension can force it out of the housing. If the

plug still does not come loose, drill a small hole in

the center of the plug, use a self tapping screw to

remove the plug.

Remove the spring and piston (A2). A small magnet

can be used to remove the piston.

Replace the split pin, the O ring (A5) and the end

plug (if a hole has been drilled in it.)

Check that all the components are clean and lubri-

cate them with fresh engine oil. Install a new O ring

on the end plug.

Install the piston in the sleeve with the open end of

the piston turned inwards. Install the spring over the

lug on the end of the piston. Install the end plug with

the sprung end inserted in the cutout in the plug.

Press in the end plug and install the split pin

through the upper hole in the housing and down

through the lower hole. Bend the split pin shafts

apart.

Relief valve, inspection

(18A-09)

Check the spring for wear and other damage and if

possible check what pressure is required to com-

press a spring to its installed length, see Workshop

manual “Technical Data”.

Check the piston for wear and other damage and

check that it travels smoothly in the socket in the

housing.

Check the housing and the end plug for wear and

other damage.

Replace worn or damaged seals.

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