65 Multipower pump pressure

Rebuilding 65 Multipower transmission. Piggyback pump for clutch pack is relieving at 300psi when dead headed. Is this enough or should I try and increase the pressure by adjusting or shimming the relief spring? Pump seems to be in good condition when inspected.
Thanks for any help.
 
On my 1965 MF-135
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You measured pressure dead headed... when Multi-Power or independant PTO clutch pack
is applied it may loose some pressure due to slight leaks in clutch packs.
When the oil is hot and thinner the pressure will be slightly lower.
I think that if the pressure is not lower than 200 PSI in all circounstaces it will be OK.

HTH

Joe
 
Joe,thanks again. My clutch pack is shot so only can build around 100 psi when pump is connected to shift valve. Looks like retaining ring came loose in clutch pack housing letting the clutch components come apart. I just tested the pump to make sure it also does not need replacement as well. I disconnected the hose from the pump and connected gauge directly to pump outlet. It builds to 300 psi idling and you can see the relief open and pump starts dumping oil. At 2000 rpm the pressure is about 310 and noticeably more volume dumping. You are correct as my parts book does not show any option for an independent pto on a 65.
 

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