201-G00 Page 5/8
MAINTENANCE
NOTICE:
Maintenance shall be performed by qualified technicians
only, following the appropriate procedures and warnings
as presented in this manual and the appropriate pump
installation, operation, and maintenance instructions.
Hazardous machinery
can cause serious
personal injury or
property damage.
Failure to set the vehicle emergency
brake and chock wheels before
performing service can cause severe
personal injury or property damage.
Hazardous
machinery can
cause serious
personal injury.
Failure to disconnect and lockout
electrical power or engine drive before
attempting maintenance can cause
serious personal injury or death
Hazardous fluids can
cause fire, serious
personal injury or
property damage.
All fluids pumped must be compatible
with piston material. Incompatibility
can cause fire, serious personal injury
or property damage.
Hazardous pressure
can cause personal
injury or property
damage.
Disconnecting fluid or pressure
containment components during pump
operation can cause serious personal
injury, death or major property damage
Hazardous or toxic
fluids can cause
serious injury.
If pumping hazardous fluids, the system
must be flushed and decontaminated
prior to performing service or
maintenance.
Hazardous pressure
can cause serious
personal injury or
property damage.
Failure to relieve system pressure prior
to performing pump service or
maintenance can cause personal injury
or property damage.
AIR VALVE MAINTENANCE
AND INSPECTION SCHEDULES
Valve Assembly
Part
Inspection
Schedule
Action Required
Breather Vent
(6A)
Weekly
If leakage is present,
IMMEDIATE valve
service is required.
Air Valve
Assembly
Annually
Disassemble, inspect
U-cup/ Quad Ring seals
and replace if cracked,
blistered or worn.
Piston Assy. (11)
3 Years
(Or Less)
REPLACE
AIR VALVE REMOVAL AND DISASSEMBLY
1. Remove the cap (1) from the air valve assembly.
Remove and discard the cap O-ring (88).
2. Remove the retaining ring (11F) and jam nuts (11E) from
the adjusting rod. Turn the adjusting bushing (2C)
counterclockwise to reduce spring tension.
3. Remove the four capscrews (5 & 5C) and washers
(5A & 5B).
4. Carefully remove the air valve assembly, spring (8), and
if necessary, the valve (9).
5. Remove and discard the gasket (10). Clean gasket
areas.
6. Clean the breather vent (6A) with an air hose to remove
any foreign matter.
7. Remove the piston (11A) with the attached adjusting rod
(11B). Inspect the coating on the piston outer diameter
for scratches, wear and surface damage. Discard the
piston if the coating is worn or damaged.
8. Remove the U-cup (6) and quad ring seals (7), being
careful not to scratch the grooves in the piston cover (4)
and discard.
9. Thread the adjusting bushing (2C), CLOCKWISE
completely into the valve cover (4).
