JRV!, JCB 1400B pump pressure test results

I pulled the pump off and dismantled it, I only got to the P1 section, so far I have seen greatly detiriorated wear plate rubber seals. I guess I was releived to see broken and detiriorated rubber seals. the seals have little 1 cm fragments missing out of them, they have broken down. Can you tell me what you feel about these seals on the wear plates being the total contributing factor (or not), do I have to replace the wear plates? and how much clearance is acceptable between the wear plate and the shaft of the gears (it is not a tight fit between the wearplate and whrere the gear shaft goes through it. What would the symptom of the gear shaft being a little open through the wear plate? I supplse its about 0.5 mm gap.

Would it be acceptable to replace all rubber seals on the pump and then re try it ? Or should I run out and puchase a whole bunch of new guts for it? if so what parts would you recommend as a minimum for an initial rebuild... remember this machine is just meant for poking around the house and not for pro use... I just want to acheive enough pressure off the pump to actually dig.

Thanks for your feed back.. I'll check the P2 stage tomorrow and get some numbers off the pump... there is no tag on the pump (it's gone, nice..) lots of numbers in the casting though.

Mike