SANDER CONTROL VALVE (cont)
CLEANING, INSPECTION, AND REPAIR
· Drycleaning solvent P-D-680 is toxic and flammable. Wear protective goggles and gloves and use
only in a well-ventilated area. Avoid contact with skin, eyes, and clothes and don't breathe vapors.
Do not use near open flame or excessive heat. The flash point is 100 - 138°F (38 - 59
°C). If you
become dizzy, get fresh air and medical aid immediately. If contact with eyes is made, wash your
eyes and get medical aid immediately.
· Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Do not direct
compressed air against skin. Use goggles or full face shield.
Use a cloth dampened in drycleaning solvent and remove grease and oil from exterior and interior of valve body
Use drycleaning solvent and clean metal parts. Dry with compressed air.
Inspect metal parts for cracks, breaks, cuts, or other damage.
Check that springs have not rusted, become distorted, or taken a permanent set.
Measure free height of spring (6). Minimum free height is 1-7/16 inch (36.5 mm).
Measure free height of spring (19). Minimum free height is 31/32 inch (24.6 mm). Replace damaged spring.
Use a multimeter and measure resistance of coil (16). Resistance is 314 to 346.5 ohms.
Repair consists of replacement of damaged parts. Whenever the sander control valve is completely disassembled,
the following parts should be replaced from repair kit:
O-rings (3), (26), (27), (31), (32), (
35), and (40)
Neoprene valve seat (10)
Plunger seats (21) and (23)
Rubber cup (33)