Maxton UC1A - Page 34

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 DRIFTS DOWN SLOWLY
 Send car to upper floor. Open main power disconnect switch.
 Close pit valve. If car still drifts, the leak is in the jack assembly.
 Back out seal nut on ML (Manual Lowering) screw one half turn. Turn ML screw in (CW) fully and
re-tighten seal nut to ensure 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# 29292A.
 If leak is present, replace with valve exchange, new valve, or contact Maxton technical support.
ADDITIONAL PROCEDURE FOR UC2A (UC2)
FULL DOWN SPEED TOO SLOW
 In examining flow charts, the down flow capacity of the UC2A (UC2) valve is 10 percent less than the
UC1A (UC1) valve.
CAR DRIFTS DOWN SLOW
 Before dismantling the down section except when the problem is pinpointed to the control block, turn DSR
(Down Speed Regulator) in (CW) fully. If this stops the leak, examine the Regulator Poppit for debris
and / or damage.
DOWN SPEED VARIES
 Adjusting with BA (Balance Adjustment) adjuster, turn in (CW) for slower and out (CCW) for faster. This
adjustment must be made with a full load.
BA ADJUSTER NOT AT FACTORY SETTING
 Call Maxton Technical Support with valve serial number.
TROUBLE SHOOTING PROCEDURES UC1, UC1A, UC2, UC2A B44