I-2 / I-3 Valve Troubleshooting
August 2019 - 89130 v.3.0 21
Troubleshooting Table - Down Operation
Problem Solution
The car will not lower.
1. Check that the line shut-off valve is fully open.
2. Check the solenoids.*
3. Turn OUT on the down start adjustment.
4. Turn IN on the down stop adjustment.
Down start is slow or bouncy.
1. Turn OUT on the down start adjustment.
2. Turn IN on the down stop adjustment.
3. Bleed the jack of air, or loosen packing, if possible.
Down start is abrupt.
1. Turn IN on the down start adjustment.
2. Turn OUT on the down stop adjustment.
The car will not stop when
started down.
1. Tighten the manual lowering valve.
2. Turn OUT on the down stop adjustment.
3. Check if the solenoid valve is not closing (residual magnetism).*
Down stop is too soft or bouncy.
1. Turn OUT on the down stop adjustment.
2. Bleed the jack of air, or loosen packing, if possible.
Down stop is rough.
1. Turn IN fully on the down slowdown adjustment.
2. Turn IN on the down stop adjustment.
3. Turn OUT, in small increments, on the down slowdown.
Leveling is bouncy.
1. Check the leveling speed. Set for 10 to 12 FPM.
2. Bleed the jack of air, or loosen packing, if possible.
The car will not slow down to
leveling speed.
1. Check the down fast solenoid.*
2. Check whether the down slowdown adjustment may be open too much (too soft).
3. Check whether the leveling speed may be set too fast. Set for 10 to 12 FPM.
Slowdown is rough. Turn OUT on the down slowdown adjustment.
The car settles (leaks) down.
1. Run the car to the lowest position.
2. Inspect the oil line, the jack, and the power unit for leaks.
3. Close the line valve.
The car settles (leaks) down, and
the oil level in the tank is less
than when first set.
1. Tightly close the manual lowering valve, and run the car to the top.
2. Shut off the power, and record the car location.
3. Wait 15 minutes, record the car location, and note the amount the car has settled
as “X.”
4. Let the car sit for 8 hours, record the car location, and note the amount the car has
settled as “Y.”
5. If “Y” is not more than 25 times “X,” arrange for homing to the lowest floor and verify
proper performance.
6. Close down the first car location, wait 15 minutes, and then record the car location.
Note the amount the car has settled as “Z.”
7. If “Z” is less than “X,” replace the down pilot body, and adjust the down functions.
8. Remove and examine the lowering and check valve pistons.
9. If the piston seat is damaged, reseat the piston and verify proper operation.
10. If the piston seat is not damaged, replace the valve, and adjust the job.
* Check the solenoids for voltage and for damage to the solenoid tube. Check the plunger
for binding. Do not reseat. If the seat in the pilot body is damaged, replace the pilot.
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