Maxton UC1A - Page 31

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).
UP SECTION (CONTINUED)
CAR OVERSHOOTS FLOOR
 Turn the UT (Up Transition) adjuster out (CCW) more.
 Check UL speed, 9-12 FPM
 Disconnect U and US coils, place call. Car should not move.
1. If car moves turn US adjuster out (CCW) more.
2. Reset BPS adjuster.
 Check hatch slow down switch and stopping circuit to make sure there is no delay
(one second lost means a three foot delay at 180 feet per minute).
 Remove the US solenoid assembly and check for foreign material and / or damage.
Ball Cage must operate freely within solenoid tube.
CAR STALLS OR LEVELING SPEED VARIES IN LEVELING ZONE
 Make sure the US (Up Stop) and U (Up) coils are connected in proper operating sequence. Refer to
Adjustment Procedure.
 Make sure the LS (Leveling Speed) adjuster dot is referenced to the line between F and S.
 Check Relief for proper setting.
 If car will not adjust using LS (Leveling Speed) adjuster, turn US (Up Stop) adjuster in (CW). Be sure to
count the number of turns for later readjustment. If the car moves, then:
1. Check for proper coil voltage.
2. Remove the US solenoid assembly and check for foreign material and / or damage.
Ball Cage must operate freely within solenoid tube.
3. Replace solenoid seat.
4. Readjust US back to original position.
 Remove BPS closure and piston. Examine piston ring for debris and / or damage, it must expand after it
has been manually compressed. Clean or free if necessary. Check piston ring for ring groove wear. Make
sure the large recycle spring grips the shoulder of the piston tightly.
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HARSH UP STOP
 Turn US (Up Stop) adjuster in (CW) for smoother stop.
 Check that the pump continues to run after car has stopped for ½ second. As a check to determine
adequate pump time, turn US (Up Stop) adjuster (CW) all the way. Car should then level and stop above
the floor. If not, there is not enough pump time.
 Check jack and guide shoes for excessive tightness. If jack packing and guide shoes are in good
condition, a soft stop will be accomplished by following the standard Adjustment Procedure.
TROUBLE SHOOTING PROCEDURES UC1, UC1A, UC2, UC2A B44