A C340 IN CRUISE AT FL210 EXPERIENCED A FROZEN ELEVATOR TRIM CTL CAUSED BY THE INCORRECT JACKSCREW LUBRICANT.

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FLT FROM O48 TO SMO; ALT FL210. RTE O48-ENI-DIRECT AVENAL-FERNANDO 5 ARR SMO. PROB: AFTER LEVELING AT FL210; NOTED ELEVATOR TRIM WAS FROZEN. PULLED ELEVATOR TRIM CIRCUIT BREAKER -- NO EFFECT. IT WAS NECESSARY TO FLY WITH MODERATE FORWARD PRESSURE ON YOKE. UNTIL I ADJUSTED TO THIS; ALT VARIED +/-200 FT. APPROX 50 NM FROM FILMORE; WAS INSTRUCTED TO CROSS 10 NM NW OF FILMORE AT 11000 FT. I NOTIFIED CTR (ZLA) FEW MINS LATER OF AMOUNT OF FORWARD PRESSURE NEEDED AND NOSE WAS BOBBING UP AND DOWN. ENTERED IMC APPROX 8000 FT. HAD DIFFICULTY KEEPING HIGH RATE OF DSCNT AND WAS NOTIFIED BY BUR APCH SEVERAL TIMES TO EXPEDITE DSCNT. BUR ASKED IF I WAS HAVING A PROB AND I INFORMED THEM OF MY TRIM AND DIFFICULTY IN PITCH CTL. AFTER INTERCEPTING INBOUND COURSE; BUR ASKED ME MY POS. I INFORMED THEM I WAS SLIGHTLY TO L OF COURSE (1/2 DOT ON HSI). THEY REPLIED I WAS TO THE R. I ASKED FOR A VECTOR AND WAS GIVEN 195 DEGS. THEY ASKED IF I WANTED VECTORS FOR A VMC APCH INTO VNY AND I DECLINED. I TUNED THE #2 RADIO TO SMO VOR AND USED IT FOR THE REMAINDER OF THE APCH. HAD THE ARPT IN SIGHT ABOUT 1/2 THE DISTANCE FROM CULVE INTXN (2.4 DME) AND THE RWY MADE AN UNEVENTFUL CIRCLE-TO-LAND APCH. PROB WAS TRACED TO THE WORM GEAR ON THE TRIM ACTUATOR. IT WAS FOUND TO HAVE WATER AND HAD BEEN LUBRICATED WITH IMPROPER GREASE. IT WAS FLUSHED WITH DOW CORNING 33 GREASE. IT IS SPECULATED THAT THE WATER FROZE JAMMING THE WORM GEAR. I WILL INFORM MY MAINT SHOP OF THE PROB UPON MY RETURN AND ALSO HAVE THE RUDDER AND ELEVATOR FITTINGS CHKED FOR PROPER GREASE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE PROB WAS CAUSED BY THE WRONG TYPE ELEVATOR TRIM JACKSCREW LUBRICANT WHICH CAUSED WATER TO COLLECT ON THE JACKSCREW ACME NUT; FREEZE; AND PREVENT MOVEMENT OF THE JACKSCREW. THE RPTR SAID WHEN THE MECH OPENED UP THE JACKSCREW PLATE THE WATER RAN OUT. THE RPTR STATED THE CORRECT GREASE WAS APPLIED TO THE JACKSCREW AND THE ELEVATOR TRIM CHKED OK.