Refer to Health and Safety section before carrying
out any service work.
Servicing unloader valve
•
Remove screws (9) and withdraw unloader valve assembly from
intake end cover.
•
On a workbench dismantle and clean assembly.
•
Check seating washer (16) for damage. Renew if necessary.
•
Renew ‘O’ rings (12) and (13) on valve body. Apply grease to ‘O’
ring (13) to hold it in position.
•
Renew‘O’ring (8) on piston (7).Ensure piston works freely in the
valve body.
Note: Screw nut (5) to bottom of thread.
•
Screw nut (14) until it touches support (15). Tighten until valve
facing (16) turns stiffly.
Note: Over tightening will distort item (16).
•
Push spring support (3) and shim (2) against spring to enable
circlip (1) to be fitted.
•
When inserting valve assembly use a slight turning action. This
should overcome O ring resistance.
Note: Valve operates as an:
Inlet valve (stop/start machines).
Inlet/unloader valve (continuous run machines).
Page 24
CompAir Hydrovane
2B Unloader/Inlet Valve
Item Part Number Description Kit
Quantity
All 705 707
3653 Unloader valve assembly 1
1 MCI-22 Circlip 22mm (internal) 1
2 71062 Shim 1
3 52502 Spring support 1
4 9402 Spring unloader valve 1
5 3656 Philidas nut M5 1
6 MW5 Washer M5 1
7 0195/1 Piston unloader valve 1
8 9754 ‘O’ Ri
ng KT71 1
9 MS706-16 Cap head screw M6 x 16 2
10 0192/1 Unloader body 1
11 MG1706-6 Grub screw tuflock M6 x 6 1
12 9804 ‘O’ Ring KM71 1
13 9704 ‘O’ Ring KM71 1
14 3655 Philidas nut M10 1
15 52064 Unloader support 1
16 0053/1 Valve facing KM71 1
17 51029 Unloader seat 1
18 51028 Unloader stem 1
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