Fuel System Kit 7261663 7256757 7256789 for Bobcat Loader A770 S740 S750 S770 S850 T740 T750 T770 T870

Fuel System Kit 7261663 7256757 7256789 for Bobcat Loader A770 S740 S750 S770 S850 T740 T750 T770 T870

This injector seal kit is engineered as a direct replacement for the Bobcat Loader A770 S740 S750 S770 S850 T740 T750 T770 T870. Manufactured to meet or exceed OEM specifications, it delivers reliable performance in demanding conditions. Each unit is tested for fuel flow, pressure rating, and durability before leaving the factory to ensure consistent quality across every order.

Vehicle Compatibility

Replaces OEM Part Numbers

Doosan • D34-400903 • 00043E-28347042 • 400912-00136c • 400912-00136b • 400912-00136 • D34400903 • 00043E28347042 • 40091200136c • 40091200136b • 40091200136Delphi • 28457195

Signs You Need a Replacement

If your equipment is showing any of these symptoms, the injector seal kit may be the cause:

• Fuel leak at injector base — Copper washers lose their crush seal over time. If you see dampness around the injector, the seals need replacement.
• Fuel in coolant or oil — A failed combustion seal allows fuel pressure to escape into adjacent passages. This is a serious issue that requires immediate attention.
• Loss of compression on one cylinder — When the copper sealing washer fails, combustion gases blow past the injector body instead of pushing the piston.

Installation Notes

Clean the injector bore thoroughly before installing new seals. Any carbon or debris left in the bore prevents the copper washer from seating properly, causing a compression leak. Use a wire brush or bore cleaning tool, then wipe with a lint-free cloth. Install the seals in the order specified in the kit — the heat shield goes on first, then the copper washer, then the O-rings. Torque the injector to the specified value and recheck after running the engine under load.

Frequently Asked Questions

Will this fit my Bobcat A770?
Yes. This part is designed to fit the Bobcat A770, S740, S750, S770 among other models listed in the compatibility table above. Verify your specific model and engine code before ordering to ensure the correct fit.

Can I cross-reference Doosan with D34-400903?
Yes. Both Doosan and D34-400903 are interchangeable OEM numbers for this part. They refer to the same component with the same specifications, just different part number revisions.

My vehicle is a 0912 model – is it covered?
The compatibility range for this part includes 0912-0013. The 0912 model year falls within this range, but verify the engine code and body type match. Mid-year production changes sometimes mean two vehicles from the same model year use different parts.

Do I need to replace the seals when removing injectors?
Yes. The copper sealing washers are single-use – they crush to form the seal and cannot be reused. Rubber O-rings harden over time from heat and fuel exposure. Even if the old seals look fine, they won’t seal properly on reassembly.

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