Lubricating Oil Cooler

The built-on lubricating oil cooler is a plate heat exchanger.

The plate heat exchanger consist of a number of cold pressed plates which are compressed between a frame plate (head) and the pressure plate (follow) by means of tie bolts.

The plates are made with special corrugations, which ensures turbolent flow and high heat transfer cofficients.

After clamping of the plate pack, the plates - which are fitted gaskets - ensure an effective seal between fluids and atmosphere. In addition, intermixing of the fluids is eliminated by a double gasket seal around the inlet ports.

Every second plate is turned through 180°. This means that the double gasket seal occurs around every second inlet to the channels between the plates.

The plate pack now forms a series of parallel flow channels in which the fluids flow in a counter current regime.

08028-0D/H5250/94.08.12

L23/30H

Disassembly:

1)Remove the coupling part or gear wheel (1), see fig. 2, by means of a puller or a soft hammer.

2)Remove screws (2) and dismount the cover

(3).

3)Dismount the locking ring (4), screws (5) and remove the cover (6) with the overspeed device.

4)Remove the gear wheel (7 and 8).

5)Dismounting of the spring loaded adjustable by-pass valve.

Remove the cap nut (9), nut (10), spring housing (11), spring (12) and the cylinder (13). If the piston (14) cannot be pulled out from the same side, the plug screw (15) can be removed and the piston can be pressed out from this side with a screw driver or the like.

Before the gear wheels (7 and 8) can be mounted the bearing bush must be adjusted with a reamer or a bearing scraper, so that the gear wheel can run easily when the pump is assembled.

8) Inspect all other parts for wear and damage, and renew, if necessary.

Fig. 1.

Overhaul.

6)Clean all the parts with gas oil and a hard brush, (never use a steel brush). The parts are blown clean with working air.

7)If the bearing bush is to be removed the existing bearing bush is plugged out by means of a mandrel, the bores are cleaned and new bearing bush is mounted, see fig. 1.

Fig. 2.

Assembly:

9)Mount the gear wheel (7 and 8).

Coat the sealing lip with silastene or similar and mount the cover (6) with gear wheel and locking ring

(4).

10)Mount the cover (3) with gasket.

11)Mount the gear wheel or coupling part (1).

For tightening the nut for gear wheel, see page 500.40.

12) Mount the spring loaded by-pass valve, nut (10) with gasket, cap nut (9) and plug screw (15).

08028-0D/H5250/94.08.12

Adjusting of Lub. Oil Pressure.

13) The outlet pressure of the lub. oil pump, can be adjusted by means of a adjusting screw in the bypass valve.

Remove the cap nut (9) and loosen the nut (10).

L23/30H

By turning the spring housing clockwise the pressure is raised and reverse the pressure is lowered by turning the spring housing (11) anti-clockwise. When the correct pressure is reached , see page 500.30, the spring housing (11) is locked with nut (10) and finally the gasket and cap nut (9) are mounted.