Gear retraction issue

[Galvine]

I have a 1979 P337H
I am having a gear retraction issue

After take off, I raise the gear handle, the green light goes off, but the gear doesn’t retract
If I lower the gear handle, the green light stays off
If I pump the emergency gear handle once, the green light comes on again and then if I raise the gear handle again, it cycles normally

And if I cycle it over and over , it works normal

I have had it in the shop twice
Fluids all good
Cycles normally when plane on jacks

Appreciate any thoughts

Greg

[Learjetter]

Consider checking these:
- check accumulator pressure is 500psi
- squat switch (check switch function at nose terminal block pins 1 &2 on left side nose gear bay) and check nose strut pressure to ensure strut extending fully)
- check each up lock and downlock switch for system continuity
- check main gear handle switch (incl diode in wire S-GD12 to contactor)
-add a little more fluid to reservoir (in case climb deck angle is causing pump to suck air/foam)
- might also be sticking door and gear solenoids (remove and clean)

- those are the quick and easy checks — good luck!

-LJ

[Galvine]

Ok
Thanks so much for the response
I’ll start there

[RandyArizona]

Landing gear control system, dwg 1571000, page 18-92 in electrical wiring diagrams, service manual.
(Picture/diagram of contactor page 18-96.. item 18)
This contactor is located, copilot side, fwd of Hyd power pack, on nose gear tunnel wall. ( inside cabin, behind a bunch of wiring)
If yours is like the usual, it is original, and in bad shape.
Easy to replace, just overlooked.

[Galvine]

Thanks for that advice
I’ll look into that as well

Greg