Maxton UC1A - Page 33

1728 Orbit Way - Minden, Nevada 89423 P: 775-782-1700 F: 775-782-1701 info@maxtonvalve.com www.maxtonvalve.com
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\\SERVER\CATALOG2019\2019CatalogRev2
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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) out (CCW). This will necessitate readjusting the DA (Down Acceleration) adjustment.
 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 (under control block) 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, turn DT in (CW) until normal leveling speed is attained.
DOWN STOP TOO SMOOTH OR INACCURATE
 Turn DS (Down Stop) adjuster out (CCW). This will necessitate readjusting the DA (Down Acceleration) adjustment.
 Check slow down switch 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 (under control block) 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.
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.
 Check down control fluid strainer (under control block) assembly for lint. If clogged, remove debris (in this case oil in
the system should be filtered).
 Remove “B” down closure and verify the down piston operates freely within its seat.
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TROUBLE SHOOTING PROCEDURES UC1, UC1A, UC2, UC2A B44