Troubleshooting
Troubleshooting
Problem | Cause | Solution |
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Motor runs but pump will not prime. | Motor rotation wrong. (12 VDC units | Check wiring instructions for possible |
| only.) | problems. |
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| Missing relief valve | Remove gear cover (1b) inspect seal |
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| (4c), replace if missing or damaged. |
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| Sheared drive key (1g). | Remove cover (1b) and inspect key |
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| (1g/10b), replace if worn or sheared. |
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| Dirt under relief poppet (4a) or seal | Remove cover (1b) and inspect, |
| (4c). | clean or replace if damaged. |
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| Strainer seal (3d) leaking. | Inspect and replace if damaged. |
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| Suction height too high to prime. | See Priming Pump, page 5. |
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| Worn or damaged gears. | Remove cover (1b) and inspect |
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| gears. Replace if worn or damaged. |
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| Fluid level low. | Refill tank. |
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| Cover seal (1f/10c) damaged. | Replace if worn or damaged. |
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| Inlet strainer (3b) clogged. | Remove and clean or replace. |
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| Air leak in suction tube. | Inspect all joints in suction tube, |
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| make sure all joints have sealant |
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| applied. |
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| Air lock in system. | This may occur if filter or meter or |
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| automatic |
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| this occurs, fill pump and meter with |
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| herbicide through top of pump. |
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| Motor does not run at proper speed. | Check electric connections. Check |
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| supply voltage for proper voltage |
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| level. |
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Unit pumps but output flow is low. | Clogged inlet strainer (3b). | Clean or replace. |
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| Air leak in suction tube. | Check to make sure all joints in suc- |
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| tion tube are sealed. |
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| Suction tube too close to tank | Suction tube must have a 2 in. |
| bottom. | (51 mm) minimum clearance. |
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| Tank empty. | Refill tank. |
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| Tank not vented. | Tank must be vented to atmosphere. |
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| Worn or damaged gears. | Remove cover (1b) and inspect |
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| gears. Replace if worn or damaged. |
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| Damaged motor. | Replace motor. |
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| Clogged suction tube, hose, or | Inspect and clean. |
| nozzle. |
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Motor stalls when nozzle is closed. | Bypass relief valve (4a) stuck. | Inspect relief valve, making sure |
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| poppet is free. Replace if damaged. |
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| Low supply voltage. | Check supply voltage. |
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| Gears (1c/10a) damaged and | Inspect gears. Gears should turn |
| binding. | freely. Replace if damaged. |
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| Faulty motor. | Replace motor. |
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8 | 311628C |
