FAQ Injection pump, set start of delivery - Zetor UR1

[Joachim]

Set delivery start at cylinder 1 (front)​

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1. static method with capillary tube:​

1. Before installing the ESP, check whether the correct drive gear is installed on the pump:
   - "3" = for 3 cylinder engines
   
   
   - "2", "4" or "2-4" = 2 and 4 cylinder engines
   
   
   - "6" = for 6 cylinder engines
   
   
2. Provide access and a clear view of the maintenance hatch on the clutch bell (left side).
   
   
3. Dismantle the maintenance hatch cover (2 screws SW 10) and find/clean the mark (yellow arrow).
   
   
   Dismantle
4. all nozzle assembly so that the engine can be turned more easily
   
   
5. Dismantle the nozzle line from cylinder 1
   
   
6. Screw the capillary tube onto pump element 1 (front).
   
   
   
7. Turn the engine clockwise (to the right) using the pulley nut until diesel comes out of the capillary tube without bubbles. (SW 46 socket and 2x extension + large ratchet)
   
   
8. Motor in clockwise (green-white arrow) rotate until the OT mark (blue arrow) is found in the maintenance hatch (blue arrow)
   
   
   A little after the TDC marking you can find the markings for the start of delivery (red arrow, here 19°, 21°, 23° and graduation lines), whereby these are indicated as degrees before TDC. Please refer to the operating instructions for the Zetor tractor for the value that matches the engine!
   
   Here again a little more clearly:
   
   
   
9. When the mark is found, turn the motor back approx. 1/2 turn
   
   
10. and now turn the motor SLOWLY again in the direction of rotation (to the right) and observe the capillary tube - as soon as the diesel in the glass tube moves/rises even slightly, stop immediately
    
    
11. Now you can read on the flywheel, the current setting value in degrees before TDC.
    In the previous photo, for example, that would be 25° before TDC and therefore a little too early for a Zetor 5211, for example, whose setpoint would be approx. 24° before TDC
    
    
12. To now correct the value, you can pivot the ESP on the flange a little, whereby you pivot in the millimeter range and then try again (turn the engine forward again until approx. 30° before TDC and then continue to rotate and observe the capillary tube...)
    
    
13. Example:
    Assuming that the UR1 motor of a Zetor 5211 should be set to 24°vOTD start of delivery and in the first test it showed 25°vOTD (i.e. early start of delivery). In order to set it to 24°vTDC (i.e. later start of delivery), the injection pump must be turned on the flange approx. 1-2 mm away from the engine towards you.
    If, for example, the sample had come out at 22°vTDC (too late start of delivery), the injection pump on the flange would have to be turned approx. 2 mm (reference value) towards the engine (to an earlier start of delivery) in order to get to around 24°vTDC.
    
    To clarify, the UR1 engine with the engine front cover open (viewed from the front)
    
    
    And again as schema UR1:
    
    KW = crankshaft
    ZR = intermediate gear
    NW = camshaft
    ESP = injection pump drive shaft
    
    
    Adjust injection pump UR1 to an earlier start of delivery:
    
    
    
    Adjust injection pump UR1 to a later start of delivery:
    

2. dynamic method with stroboscope:​

1. In Progress ...

 

[farmworksmartin]

Thanks, this is really helpful.
Do you have the direction of rotation for the camshaft labelled incorrectly on your schematics though??

 

[Joachim]

Do you have the direction of rotation for the camshaft labelled incorrectly on your schematics though??

Oh, yes - sorry I have to rework this again. Thanks.