1728 Orbit Way - Minden, Nevada 89423 P: 775-782-1700 F: 775-782-1701 info@maxtonvalve.com www.maxtonvalve.com
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CAUTION:
The information herein is for use by skilled hydraulic elevator professionals.
Before disassembly of the valve, make sure the power is off by turning the main disconnect switch
off and that the elevator is resting on the buffers (zero system pressure).
DOWN SECTION (CONTINUED)
CAR WILL NOT STOP IN DOWN DIRECTION
Make sure coils are not energized.
Turn DT (Down Transition) adjuster out (CCW) fully.
Remove D solenoid assembly and check for debris and / or damage. Ball Cage must
operate freely within solenoid tube.
Replace solenoid Ball Cage.
Replace solenoid seat.
Remove valve closure and check piston guides to make sure they operate freely within
their respective seats.
Check down control fluid strainer assembly for lint. If clogged remove debris (in this case oil in
the system should be filtered).
CAR DRIFTS SLOWLY DOWN
Send car to upper floor. Open main power disconnect switch.
Close pit valve. If car still drifts the leak is in the jack assembly.
Turn ML (Manual Lowering) screw out (CCW) and then turn in (CW) fully to insure a good seat.
Turn DA (Down Acceleration) adjuster in clockwise (CW) fully. If leak stops, this indicates a
leak at the down solenoids. Replace D and DL solenoid seats. Refer to Solenoid Kit #292920.
If leak does not stop, this indicates a leak at the down guide seal. Remove Down / Check
guide and examine seal on guide for damage and / or debris. Examine Down / Check seat.
It must be free from nicks or scratches on the small internal radius.
CAUTION: If the down piston is removed from the valve then regulator rod must be
reconnected to the back side of the down piston between the roll pin and ball bearing.
Call Maxton for reassembly instruction
TROUBLE SHOOTING PROCEDURES UC4, UC4M, UC4MR B44
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