to open, which releases all of the Wire of whisker valve broke off. air from the grey circuit and the Ring at top of sensor shaft fell off. timing chamber. Whisker not engaged with ring But if the rubber seal inside the whisker valve is screwed up, it Sensor bell broken off enough air to cause doesn’t release the pressure drop and the EV-125 Sensor bell moved up on shaft, slugs never opens, pressure gradually don’t reach it. increases and machine comes off too Restrictor is leaking internally, early. supplying more air to timing circuit And there you are…. than whisker valve can get rid off. Replace D-Restrictor. Problem I - Machine comes off early - cow is still milking Milk hose from claw to sensor too Possible Reasons: short. There must be a generous loop before the hose goes into the sensor, Make sure the air bleed hole of the at least 8” vertical incline so proper claw is open. Flow sensor works on slug can form. the pendulum principle, milk slugs set it to swinging. If no bleed air, there’s When you push the start button, there are no slugs. Machine will come machine starts, but it shuts off off early even is the air bleed is only instantly when you let the button go. partially plugged. Two possible causes: End-of-Milking timers may be too PT-421 Main valve is not working short. We generally recommend may properly. Replace PT-421, or be 7 sec., meaning some milk will be EV-125 is not releasing the air left in one or two of the quarters. If properly. Replace EV-125 you prefer to draw the fumes out of the udder, you may need 15 or 20 Someone replaced the PT-100 and/or the second timers. PT-210 on the 2 min. Start-Up Timer, but installed them up-side- down. When Cow never let the milk down the machine is not milking air from the blue hose must actuate the PT-100 pilot. Old milk hose at Pinch Valve. Remove pilot from PT-210 2-way valve Partially collapsed hose restricts milk and watch it operate. flow into sensor, resulting in weak slugs.
to open, which releases all of the air from the grey circuit and the timing chamber. But if the rubber seal inside the whisker valve is screwed up, it doesn’t release enough air to cause the pressure drop and the EV-125 never opens, pressure gradually increases and machine comes off too early. And there you are…. Problem I - Machine comes off early - cow is still milking Possible Reasons: Make sure the air bleed hole of the claw is open. Flow sensor works on the pendulum principle, milk slugs set it to swinging. If there’s no bleed air, there are no slugs. Machine will come off early even is the air bleed is only partially plugged. End-of-Milking timers may be too short. We generally recommend may be 7 sec., meaning some milk will be left in one or two of the quarters. If you prefer to draw the fumes out of the udder, you may need 15 or 20 second timers. Cow never let the milk down Old milk hose at Pinch Valve. Partially collapsed hose restricts milk flow into sensor, resulting in weak slugs. Wire of whisker valve broke off. Ring at top of sensor shaft fell off. Whisker not engaged with ring Sensor bell broken off Sensor bell moved up on shaft, slugs don’t reach it. Restrictor is leaking internally, supplying more air to timing circuit than whisker valve can get rid off. Replace D-Restrictor. Milk hose from claw to sensor too short. There must be a generous loop before the hose goes into the sensor, at least 8” vertical incline so proper slug can form. When you push the start button, machine starts, but it shuts off instantly when you let the button go. Two possible causes: PT-421 Main valve is not working properly. Replace PT-421, or EV-125 is not releasing the air properly. Replace EV-125 Someone replaced the PT-100 and/or the PT-210 on the 2 min. Start-Up Timer, but installed them up-side- down. When the machine is not milking air from the blue hose must actuate the PT-100 pilot. Remove pilot from PT-210 2-way valve and watch it operate.