Refer to Health and Safety section before carrying
out any service work.
Servicing servo valve
•
Remove screws (7) and withdraw servo valve assembly from
intake end cover.
•
On a workbench, dismantle and clean assembly.
•
Renew housing gasket (9).
•
Renew ‘O’ rings (10) and (11).
•
Removal and refitting of piston (6) is simplified using a threaded
rod (1/4" B.S.F.) screwed into the end of the piston.
•
Prior to assembly, ensure piston (6) is free from sharpedges and
surface damage. Coat piston with an APPROVED OIL and
ensure that it slides freely within the housing (8). DO NOT USE
GRINDING PASTE.
•
Pistonmust be insertedintothe housing, cross-drilledend first.
•
Fit spring (5) and insert support (4) in end cap.
•
Ensure circlip (12) is securely located in housing.
•
Nut (2) should be left loose to enable setting of servo (see
TESTING) when all servicing has been completed.
Testing
•
Remove air intake filter.
•
Remove plug and seal.
•
Close outlet valve and start compressor.
•
Slacken nut (2).
•
Adjust screw (1) until gauge pressure indicates 7.5/7.8 (for 7 bar
compressor) or 10.5/10.8 bar (for 10 bar compressor).
•
Tighten nut (2) after adjustment, ensuring screw (1) is held in
position using an allen key.
Page 26
CompAir Hydrovane
2C Servo Valve
Item Part Number Description Kit
Quantity
All 705 707
32505 Servo valve assembly (7 bar models) A/R
32624 Servo valve assembly (8 and 10 bar) A/R
1 MG706-30 Grub screw M6 x 30 1
2 MN106 Lock nut M6 1
3 57577 Servo end cap 1
4 52499 Spring carrier 1
5a 9401 Spring (7 bar) A/R
5b 9415 Spring (8 and 10 bar) A/R
6 RO800-42 Piston 1
7 MS706-20 Socket head screw M6 x 20 2
8 57576 Servo housing 1
9 57761 Gasket KM71 1
10 9717 ‘O’ Ring KM71 1
11 9715 ‘O’ Ring KM71 1
12 C18 Circlip ½ internal 1
A/R = As required
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