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1728 Orbit Way - Minden, Nevada 89423 P: 775-782-1700 F: 775-782-1701 [email protected] www.maxtonvalve.com
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\\SERVER\CATALOG 2019\2019 Catalog Rev 2
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
CAR WILL NOT LOWER
Check coil voltage.
Check line shut off valve and tank shut off valve.
Turn DS (Down Stop) adjuster in clockwise (CW) to stop.
Turn DA (Down Acceleration) out counterclockwise (CCW) more.
Turn DT (Down Transition) adjuster in (CW) slowly. If car will not lower, turn ML (Manual Lowering) screw out (CCW) all the way.
If car lowers with ML screw open, first check for proper coil voltage. If voltage is correct, then check both D and DL solenoid
assemblies for debris and / or damage. Ball Cage must operate freely within solenoid tube.
Replace solenoid seat.
Remove Down 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.
Check piston guide and seat for freedom of movement.
SLOW DOWN START
Turn DA (Down Acceleration) adjuster out (CCW).
Turn DS (Down Stop) adjuster in (CW).
Check jack packing and guide shoes for any binding.
Remove D solenoid assembly. Check for debris and / or damage. Ball Cage must operate freely within solenoid tube.
Replace solenoid seats.
HARSH OR BOUNCY START
Bleed air from jack.
Check for tight packing or guide shoe friction.
FAST DOWN START
Turn DA (Down Acceleration) adjuster in (CW).
CAR COMES DOWN IN LEVELING SPEED ONLY
Check coil voltage to D (Down Valve) solenoid.
Land car and remove D solenoid assembly. Check for debris and / or damage.
Ball Cage must operate freely within solenoid tube.
Replace solenoid seats.
MAIN DOWN SPEED TOO SLOW
Make sure gate valves are open between valve and jack and between valve and tank.
Turn D (Down Speed) adjuster out (CCW).
Replace solenoid seats.
Check flow capacities of pipe between valve and jack and between valve and tank
(must not exceed 20 feet per second).
Remove down closure and piston. Check piston ring on Down piston for debris and / or damage, it must expand after it has been
manually compressed. Check piston ring for groove wear. Install pressure gauge at “B” port. Check pressure during full down
speed, no load and compare to flow chart. If there is any abnormal pressure drop, check for restriction in piping from valve to jack
and from valve to tank.
TROUBLE SHOOTING PROCEDURES UC1, UC1A, UC2, UC2A
B44
Содержание EMV10
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