Page 7-70
MDE-4334C Atlas Start-up and Service Manual · April 2008
Hydraulic/Mechanical Components
Valves
Solenoid Valves for 9x40, 9850 and 9x53 with Satellite Outlet Piping
Figure 7-33: Solenoid Valves with Satellite Outlet Piping
Troubleshooting
Problem
Recommended Solution
No flow or slow or fast flow
Check valve power, then hydraulic parts (diaphragm, spring, core, and
so on)
Pulsing flow
Check the hydraulic part of the valve
Missed Preset
Check the hydraulic part of the valve and the unit firmware
Delivery is indicated but nozzle is closed
Check the valve diaphragm, STP check valve, or use of softwall hose
Rebuilding or Replacing
Labor cost for your area may determine your service philosophy. High labor costs favor
replacement. Difficult removal from unit favors partial rebuild in the unit. Gasboy
recommends the following services for average or lower than average labor costs.
For Valves
Recommended Service
Less than two years old
Use a repair kit (replace spring, diaphragm, and O-
Rings)
More than two years old or high usage
Replace the valve
Service Steps
Read and follow all safety precautions as outlined in
and
at the start of this section.
To service solenoid valves, proceed as follows:
1
Power-up and check power to the valve.
2
Shut off power to the unit. Check disconnected valve coils for continuity.
• Resistance across coils is 200-500 Ohms (approximate) for most single-stage valves.
• Two-stage valves have two coils with two different resistances, 200 and 500 Ohms
(approximately).