Repair
311688L 13
Repair
Prepare the Pump for Repair
1. Flush the pump if possible, page 11.
2. Relieve the pressure, page 10.
3. Disconnect the air and fluid hoses.
4. Remove the pump from its mounting and take it to
the work bench.
General Repair Notes
• A qualified technician should make all repairs.
• Inspect and clean all parts thoroughly before reas-
sembly.
• Use only genuine Graco replacement parts, avail-
able from your Graco distributor.
• Be careful not to damage sealing surfaces.
• Replace all o-rings removed from the pump.
• Follow all lubrication, torque, and repair notes in the
repair procedures.
• Do not use silicone or silicone-based grease.
• Fluid cover fasteners have a thread-locking adhe-
sive patch applied to the threads. If this patch is
excessively worn, the screws may loosen during
operation. Replace screws with new ones, or apply
medium-strength (blue) thread locker to the threads.
Fault Indications
During operation, check for indications of worn or dam-
aged parts, such as:
• major pressure fluctuations
• change in the pump’s operating sound
• irregular operation.
Always replace worn or damaged parts immediately to
prevent additional damage.
Tools Required
• 3, 4, and 6 mm allen wrenches
• 12, 19, and 22 mm open end wrenches
• internal snap ring pliers
• helicoil thread insert installation tool
• o-ring pick
• needlenose pliers
• vise with soft jaws
