Graco Dyna-Star 25T843, Instructions Manual

Page: 10 / 22

Repair
10 Manual 3A7718A
Repair
Preventive Maintenance
Schedule
The operating conditions of the system determine how
often maintenance is required. Establish a preventative
maintenance schedule by keeping a record of when and
what type of maintenance is needed, and then
determine a regular schedule for checking the system.
Pressure Relief Procedure
1. Turn off the air supply to the pump.
2. Close the bleed-type master valve (required).
3. Open the fluid ball valve and/or dispensing valve to
relieve fluid pressure.
Repair Air Valve
Refer to Parts , on page 16 for this section.
Replace Complete Air Valve
1. Stop the pump in the middle of its stroke. Follow
Pressure Relief Procedure , page 10.
2. Disconnect the air lines.
3. Remove screws (18), see Parts , page 16.
4. Remove the air valve (17) and gasket (16).
5. To repair the air valve, start at Disassemble the Air
Valve , page 11, step 1. To install a replacement
valve, continue to step 6.
6. Lubricate and align the new air valve gasket (16) on
the manifold.
7. Lubricate the air valve plate (105), then attach the
air valve (17) (torque 95 - 105 in-lb/10.7 - 11.9 N•m).
• Trapped air can cause the pump to cycle
unexpectedly, which could result in serious injury
from moving parts,
• Relieve pressure when stopping the pump and
before cleaning, checking, or servicing equipment.
• Do not lift or move the motor while pressurized.