Maxton UC1A - Page 63

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)
DOWN TRANSITION TOO SLOW
 Turn DT (Down Transition) adjuster out (CCW).
 Check slow down switch and relays for possible delay
 Remove D solenoid assembly and check for debris and / or damage. Ball Cage must
operate freely within solenoid tube.
 Replace solenoid seat.
 Check down control fluid strainer assembly for lint. If clogged remove debris
(in this case oil in the system should be filtered).
NO DOWN LEVELING SPEED
 Turn DA (Down Acceleration) adjuster out (CCW).
 Turn ML (Manual Lowering) screw out (CCW).
 If car lowers:
1. Check voltage to DL solenoid coil.
2. Remove DL solenoid assembly and check for debris and / or damage.
Ball Cage must operate freely within solenoid tube.
3. Replace solenoid seat.
 If car does not lower, remove valve closure, check down leveling spool and spring to
make sure it is not sticking (or broken) and is assembled in proper order.
DOWN STOP TOO SMOOTH OR INACCURATE
 Turn DS (Down Stop) adjuster out (CCW). This will necessitate readjusting the DA
(Down Acceleration) adjustment.
 Check hatch switches and relays for possible delay.
 Remove DL solenoid assembly and check for debris and / or damage. Ball Cage must
operate freely within solenoid tube.
 Check down control fluid strainer assembly for lint. If clogged remove debris (in this case oil in
the system should be filtered).
DOWN STOP TOO ROUGH
 Turn DS (Down Stop) adjuster in (CW).
 Check for tight jack packing or guide shoes.
TROUBLE SHOOTING PROCEDURES UC4, UC4M, UC4MR B44