Main Starting Valve

08028-0D/H5250/94.08.12

Related procedure:

L23/30H

Warning:

Do not attempt any maintenance on the main starting valve before the starting air system has been bled off.

Important:

The main starting valve should be periodically lubricated as follows:

1)Blend off the air pressure.

2)Remove the plug screw (A), see fig 1 and squirt about 30 g of 10 w oil into the valve through the plug opening.

3)Reinstall the plug.

Disassembly:

B

6

1

4

D

7 5

8

11

A

9

10

Fig 1. Main starting valve.

4)Clamp the main starting valve, in a vice with the locking ring (9) end up.

5)Carefully remove the locking ring (9). The end plug (3) should spring out. If it does not, tap the valve housing (1) lightly with a soft hammer until it does.

6)Remove the end plug (3), spring (8) and piston

(2)assembly.

7)Remove and discard all used O-rings, O-rings retainer (5), bumper (7) and spring (8).

8)Wash all other parts in a clean, nonflammable solvent.

Reassembly:

9) Using O-ring lubricant, lubricate and install the new piston O-ring (4) and the new upper piston O-ring

(6) on the piston (2).

Note: The upper piston O-ring (6) is slightly larger in diameter than the end plug O-ring (11).

10) Turn the piston over and insert the new bumber

(7).

11)Using O-ring lubricant, lubricate and install the new end plug seal O-ring (10) and the new end plug O-ring (11) on the end plug (3).

12)Lubricate the lower small bore of the valve housing (1) with O-ring lubricant.

13)Insert the piston assembly into the valve housing. Push on the piston until the piston O-ring seats against the bevelied face.

14)Install the new O-ring retainer (5) with the large opening over the piston O-ring.

15)Place the new piston spring (8) on the piston.

16)Place the end plug assembly on the piston spring.

17)Using a press to hold down the end plug assembly, install the end plug locking ring (9).

08028-0D/H5250/94.08.12

08028-0D/H5250/94.08.12

L23/30H

Starting position:

Compressed air connected to the engine.

Related procedure:

L23/30H

With air connected.

1)Examine the piping system for leaks.

2)Retighten all bolts and nuts in the piping system.

3)Drain the system for condensed water. - This should be based on observations.

With air disconnected and stopped engine.

6)Move all valves and cocks in the piping system. Lubricate valve spindles with graphite or similar.

7)Connect the air supply and make a function test of the emergency valve. See description 513.01.