300.9D VPS Mini Hydraulic Excavator Machine Systems Caterpillar

Fuel Injection Pump

Usage:

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Table 1
Specification for 373-9735 Fuel Injection Pump Gp
Item	Qty	Part	Specification Description
-	-	-	Type is In-line.
			Injection pressure is 11800 to 12800 kPa (1711 to 1857 psi).
			Revs control is mechanical.
			Lubrication system is force-feed engine oil lubrication.

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Table 2
Item	Qty	Part	Specification Description
-	-	-	Remove the V-belt, pulley, and fan wheel with a suitable tool.
			Mark the original position of the injection pump on the pump and gear casing.
			Shut off the fuel supply (fuel cock), clean the area of the injection pump and have a container ready to collect any leaked fuel.

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Table 3
Item	Qty	Part	Specification Description
-	-	-	Remove fuel injection lines (A) and fuel and leak oil lines (B). Close any open connections to prevent dirt and to minimize leakage.
			Unhook the Bowden cable on the injection pump and remove the cutoff solenoid.

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Illustration 4	g03549177
Removing the lubrication oil line

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Table 4
Item	Qty	Part	Specification Description
-	-	-	Remove lubrication oil line (C) from the injection pump and cylinder block.
			Note: Do not bend the lubrication oil line and protect against damage.

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Table 5
Item	Qty	Part	Specification Description
-	-	-	Remove cover (D) of the injection pump on the gear casing.
			Cover (D) is installed with sealant, therefore separate the cover from the gear casing with a scraper.

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Table 6
Item	Qty	Part	Specification Description
-	-	-	Mark position (E) of injection pump gear (F) in relation to gear position (G).
			After marking, do not turn the crankshaft. Tighten the screw of the pulley with a long spanner to fix the crankshaft in place.
			Slacken lock nut (H) of gear (F) and unscrew until the shaft end of the injection pump.

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Table 7
Item	Qty	Part	Specification Description
-	-	-	Use an extractor (J) to pull off/slacken gear (F) on the conical shaft.
			Loosen lock nut (H) completely and remove from the gear casing with the spring washer and gear (F).
			Note: Gear (F) of the injection pump can be removed from the gear casing. Recommend, however, leaving gear (F) meshed with the gear (G) in the gear casing.

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Table 8
Item	Qty	Part	Specification Description
-	-	-	Do not slacken screws (K) of the gear of the injection pump, as specify the precision setting of the fuel injection pump set by the manufacturer. This is difficult or even impossible to set the correct injection time.
			Remove the fuel injection pump. To this purpose unscrew the three fastening screws of the injection pump.
			Note: After removing the injection pump, do not turn the crankshaft anymore. Tampering with the sealed screws is not allowed.

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Table 9
Item	Qty	Part	Specification Description
-	-	-	Check the position of the gears with mark (E) made during removal.
			Fit a new O-ring on the flange of the injection pump with grease.
			Ensure that the shaft of the injection pump is clean and dry.
			The feather key on the shaft of the injection pump must be aligned with the groove in the hub and gear.
			Fit the injection pump and tighten the securing screws hand tight.

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Illustration 10	g03549416
Gear casing mark (1) Idler gear (2) Camshaft gear (3) Injection pump gear (4) Crankshaft gear

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Table 10
Item	Qty	Part	Specification Description
-	-	-	If the injection pump is installed in a diesel engine in which the gear casing was also removed, alignment is possible with the marks on the gears of the injection pump, camshaft, crankshaft, and idler gear.
			Ensure that all three marks (A, B, and C) are aligned.
			Mount the lock nut with spring washer and tighten to the correct torque: Torque to 59 to 69 N·m (44 to 51 lb ft) Never use oil or grease for assembly. Tighten the screw of the pulley with a long spanner to fix the crankshaft in place.
			Set the injection pump to the original position with the marks on the gear casing and injection pump housing made during removal.
			Note: If a new injection pump is fitted, the mark on the injection pump housing made at the factory is used and must align with the mark on the gear casing.
			Tighten the fastening screws of the injection pump to the correct torque.
			Fit the fuel lines back on again refer to Illustration 4.
			Hook up the Bowden cable again and fit the cutoff solenoid.
			If a new or newly calibrated injection pump is fitted, the injection time must be checked before all components have been fitted.
			It is not necessary to check the original injection pump, but is recommended.
			Fit the cover of the injection pump on the gear casing and tighten the screws. Install the lubrication oil line back on again. Apply sealing compound to the sealing surface.
			Fit the fuel injection lines back on again refer to Illustration 3.