L2550 - Hard starting at all temps

[North Idaho Wolfman]

Your glow plugs are in spec:
You need to do a compression test.
This engine does not have rebuildable injectors, they can be tested but not worth it.
You can buy new injectors for cheaper than testing.

Fuel Injector 17391-53000 27836 for Kubota L2250F L2650F L2850DT L3250DT L4150DT | eBay

L2650DT, L2650DTGST, L2650DTWET, L2650F, L2850DT, L2850DTGST, L2850F. Part No.:17391-53000, 1903-3023, 27836. L3250DT, L3250F, L3350DT, L3450DT, L3450DTGST, L3450DTWET, L3450F, L4150DTN. Kubota Compact Tractor - L2250DT, L2250F, L2550DT, L2550DTGST, L2550F, L2550TOW.

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[GreensvilleJay]

yessh, 1/2 ohm so will draw 25 amps +-, EACH ! Hope you got REAL good battery 'under the hood'
OK, curious, I pull an L2250-2550 WSM and it shows the 3 glowplugs in series BUT... the GP test from NIW post shows 'tab to ground'..which would indicate a parallel circuit and 75 amps...

are there 2 different L2550 tractors ??

 

[North Idaho Wolfman]

yessh, 1/2 ohm so will draw 25 amps +-, EACH ! Hope you got REAL good battery 'under the hood'
OK, curious, I pull an L2250-2550 WSM and it shows the 3 glowplugs in series BUT... the GP test from NIW post shows 'tab to ground'..which would indicate a parallel circuit and 75 amps...

are there 2 different L2550 tractors ??

No there is not mutiple different glow plug set ups.
ALL glow plug circuits in Kubota's are parallel, exception of the very very old models.
Just have to look at the flow print and not the wire color print.