Maxton UC1A - UP SECTION

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
PUMP RUNS, CAR DOES NOT MOVE
 Check valve for proper sizing in accordance with adjustment instruction.
 Make sure gate valves are open in system as required.
 If car is resting on buffers, make sure main down piston is not open by manually closing it with the D (Down Speed
adjuster). Turn D (Down Speed) adjuster in clockwise (CW) to stop, then back out counterclockwise (CCW) to it’s
normal position (count number of turns in and out to avoid lengthy adjustment).
 Turn US (Up Stop) adjuster in (CW) fully.
1. If car moves, check for proper voltage to coils.
2. If voltage is correct, remove US solenoid assembly. Visually inspect parts for foreign
material and / or damage. Ball cage must operate freely within the solenoid tube.
3. If car does not move, repeat procedure with UT (Up Transition) adjuster and U solenoid
assembly.
4. Check up control fluid strainer underneath the up control block for lint. If clogged, remove debris
(in this case oil in the system must be filtered).
 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.
SLOW UP ACCELERATION
 Turn UA (Up Acceleration) adjuster out (CCW).
 Check belts and pulleys on pump and motor to make sure they are not slipping.
 Check relief valve for proper setting. Refer to Adjustment Procedures.
 Check motor for proper HP rating and line voltage for excessive voltage drop.
 Remove control block and check up control fluid strainer for lint. If clogged, remove debris (in this case oil in the
system must be filtered).
UP ACCELERATION ROUGH
 Check jack packing and guide shoes for excessive tightness.
 Check valve for proper sizing.
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 motor for proper HP rating and line voltage for excessive voltage drop.
 Turn UT (Up Transition) adjuster in (CW). If this corrects the problem:
1. Check for proper coil voltage on up coils.
2. Check both U and US solenoid assemblies for damage to seats, debris and free movement of ball cages.
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TROUBLE SHOOTING PROCEDURES UC1, UC1A, UC2, UC2A B44