Maxton UC1A - Page 61

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 contained 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)
UP SPEED SLOW
 Check belts and pulleys on pump and motor to make sure they are not slipping.
 Check relief valve for proper setting.
 Check for proper voltage on up coils
 Check motor for proper HP rating and line voltage for excessive voltage drop.
 Check both U and US solenoid for damage to seats, debris and free movement of Ball Cage.
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.
 Replace the BPS adjuster.
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 LS (Leveling Speed) adjuster dot is referenced to the line between F and S.
 Check relief valve for proper setting.
 If car will not adjust using LS (Leveling Speed) adjuster, turn US (Up Stop) adjuster in
(CW), then if car moves;
1. Check for proper coil voltage.
2. Remove US (Up Stop) solenoid assembly and check for debris and / or damage.
Ball Cage must operate freely within the solenoid tube.
3. Replace the solenoid seat.
 Remove the valve closure, examine bypass piston for damage.
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 in (CW) fully.
Car should then level and stop above the floor. If not, there is not enough pump time.
 Check for tight packing or guide shoes. If jack packing and guide shoes are in good condition,
a soft stop will be accomplished by following the standard Adjustment Procedures.
TROUBLE SHOOTING PROCEDURES UC4, UC4M, UC4MR B44