Injection Equipment; Fuel Circuit; Injection Pumps; Checking Injection Pumps - Kohler KD 425-2 Workshop Manual

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Use and maintenance manual (154 pages)

Owner's manual (136 pages)

Use and maintenance (85 pages)

Table Of Contents

Table of Contents

KD 425-2 Workshop Manual_cod. ED0053029360_1° ed_ rev. 00

Fuel circuit

Fuel feeding can be either gravity type or forced, with a mechanical

double diaphragm pump operated a cam located on the camshaft.

Fuel is filtered by a filter in the fuel tank or through an external filter

cartridge.

The fuel circuit is bled of air automatically.

Components of figure 38:

1. Fuel tank - 2. Fuel filter - 3. Fuel supply lines - 4. Fuel injection

pumps - 5. Bleed off connection - 6. Fuel injectors - 7. Injection lines -

8. Fuel return lines - 9. Fuel sully pump.

Injection pumps

Components of figure 39:

1. Delivery connection - 2. O-ring - 3. Filler - 4. Washer - 5. Valve

spring - 6. Delivery valve - 7. Injection plunger - 8. Lower plate -

9. Spring - 10. Top plate - 11. Retaining ring - 12. Adjustment slee-

ve - 13. Pump body - 14. Sleeve securing pin - 15. Distance ring -

16. Eccentric pin - 17. Cap - 18. Clip for BOSCH pump type PF30.

Checking injection pumps

Before dismantling the injection pumps check for pressure leak of the

pumping unit, plunger and valve, as follows:

1. Connect a pressure gauge with 600 Kg/cm² full scale to the die-

sel delivery line (fig.40).

2. Set the control sleeve (nr. 12, fig.39) to a mid-point delivery posi-

tion.

3. Turn the flywheel slowly until the plunger has completed a full

compression stroke.

4. Take the pressure gauge reading. If it is below 300 Kg/cm² the

complete plunger unit must be changed.

During the test the reading on the gauge will show a progressive

pressure increase to a maximum value and then will fall suddenly and

stop at a lower pressure. Replace the valve if the fall in pressure ex-

ceeds 50 Kg/cm² and continues to fall slowly.

The pressure drop from 200 Kg/cm² to 150 Kg/cm² must occur in a

time interval of no less than 7 seconds.

Injection pump setting (fig.41)

Set the maximum quantity delivered by the pump by turning the ec-

centric pin using a screwdriver (nr. 16, fig.39).

With the control sleeve at 10mm from the stop position and the pump

running at 1,500 rpm, the quantity of fuel for 1,000 shots must be

between:

23 ÷ 25 cc