LEGEND:
= Items contained within Air End Kits
st1dl5sm-rev0717
www.sa n dpiper p ump.co m
11 • Model ST1/ST25
IMPORTANT
Read these instructions completely, before installation
and start-up. It is the responsibility of the purchaser
to retain this manual for reference. Failure to comply
with the recommendations stated in this manual will
damage the pump, and void factory warranty.
Main Air Valve Assembly Parts List
Item Part Number Description Qty
1 031.111.557 Air Valve Assembly 1
1.A 031.083.000 Sleeve and Spool Set with Pins 1
1.B 095.051.557 Air Valve Body 1
1.C 560.058.360 O-ring 8
1.D 132.028.552 Bumper 2
1.E 165.078.147 End Cap 2
1.F 560.029.360 O-ring 2
1.G 675.043.115 Retaining Ring 2
1.H 210.008.330 Safety Clip 1
Air Distribution Valve Servicing
See repair parts drawing above.
Step 1: Remove end cap retainer (1G).
Step 2: Remove end cap (1E), bumper (1D) and o-rings (1C and 1F).
Step 3: Remove spool part of (1A) (caution, do not scratch).
Step 4: Press sleeve (1A) from body (1B).
Step 5: Inspect O-Ring (1C) and replace if necessary.
Step 6: Lightly lubricate O-Rings (1D) on spool (1A).
Step 7: Press sleeve (1A) into body (1B).
Step 8: Reassemble in reverse order.
Note: Sleeve and spool (1A) set is match ground to a specied clearance
sleeve and spools (1A) cannot be interchanged.
1A
1A
1C
1D
1C
1F
1E
1G
1B
1D
1C
1F
1G
1H
1E
Air Distribution Valve Assembly
With Cast Iron Center
Waiting for new Drawing / Information
MODEL SPECIFIC
4: AIR END