Troubleshooting - Graco B Series Instructions-Parts List Manual

WARNING
To reduce the risk of serious bodily injury, including
fluid injection, splashing in the eyes or on the skin,
or injury from moving parts, always follow the
Pressure Relief Procedure on page 5 whenever
the pump is shut off, before installing, cleaning,
adjusting, removing or servicing the valve or any
part of the system, and whenever you stop
spraying.
Problem
No pressure regulation
Pressure creeps above
setting
Pressure drops below setting
Fluid leaks from under spring
housing (16)

Troubleshooting

Cause
Damaged diaphragm (26 or 27).
Damaged valve actuator (9).
Damaged diaphragm (26 or 27).
Ball (5) or seat (6) leaking or dirty.
Empty/clogged supply line.
Using valve beyond its rated flow
capacity. See page 13.
Loose spring housing.
Damaged diaphragm (26 or 27).
Get other manuals https://www.bkmanuals.com
NOTE: Check all possible remedies in the table below
before you disassemble the valve.
Solution
Replace diaphragm. See page 7.
Replace valve actuator. See page 7.
Replace diaphragm. See page 7.
Replace the cartridge or clean seat.
See page 7.
Fill/flush supply line.
Install valve for each spray gun or
dispensing valve.
Tighten screws (19) in sequence and to
torque shown in Fig. 2 on page 7.
Replace diaphragm. See page 7.
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