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replacement Method of Pump Head of Yangma diesel engine:
1. Note: Before removing each component, clean the junction between each part of the pump head and the pump body to prevent pollution;
2. Remove 4 high-pressure oil pipe, oil inlet hose and oil return hose
3. Remove the water inlet hose and water return hose;
4. Remove stall solenoid valve;
5. Remove 4 delivery valve, keep the removed delivery valve spring, valve core, steel ball and other requirements, ensure cleanliness, cannot be exchanged, prevent loss, pay attention to the direction, clean with diesel when installing.
6. Remove the screw on the right side of the pump head 2. Pay attention to the screws, copper gasket and filter screen removed cannot be lost;
7. Remove the left screw of the pump head 1. Take out the plunger valve core, pay attention to the notch direction of the plunger valve core, and mark it well. Keep the original notch direction unchanged during installation.
8. Remove 4 inner hexagon screw
9. Loosen the side screws, turn limited block 90 ° to the left, and take out the pump head
10. Remove the rubber cover and lower rubber cover on the head of the new pump and take out the plunger valve core
11. Place the new pump head vertically and horizontally on the pump body (pay attention to the clean surface of the pump body, and do not have dirt falling into the pump body to avoid pollution), gently press the pump head into place with your right hand, note that when installing the pump head, put the middle finger of the left hand into the stall solenoid valve installation hole and push tappet rod, so that the fork wheel is right to the bottom wheel groove, until the pump head can be installed smoothly, four inner hexagon screw can be tightened, and it must not be installed easily.
12. After the pump head is installed, put the middle finger of the left hand into the stall solenoid valve installation hole and push tappet Rod. If the pump head can be smoothly pushed, the stuck phenomenon cannot occur;
13. Install the new plunger valve core in the notched direction, and gently press down into place;
14. Tighten screws 1 and 2;
15. Turn limited block to the vertical position and tighten the side screws;
16. Install 4 delivery valve, pay attention to delivery valve clean with diesel before installation, and do not let dirt fall into the installation hole of the valve body;
17. Install stall solenoid valve, high-pressure oil pipe, oil inlet hose, oil return hose, inlet pipe and outlet pipe;
18. Fully check whether there is any leakage phenomenon;
19. Remove the air from the oil circuit and turn electric door lock spoons clockwise to * grid (power on), but do not start the engine. At this time, loosen the connecting injection pump inlet pipe until diesel oil comes out and tighten it, if the oil is injected regularly after the high-pressure oil pipe is removed, it indicates that the oil supply is normal.
20. Start the engine
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