Preventive Maintenance; Troubleshooting Guide - MAC TOOLS JSA250USA Instrucciones De Operacion Y Lista De Partes

Parts List & Operating Instructions
Important: The greatest single cause of failure in hydraulic units is dirt. Keep the service jack clean and well lubricated
to prevent foreign matter from entering the system. If the jack has been exposed to rain, snow, sand, or grit, it must be
cleaned before it is used.
1. Store the jack in a well-protected area where it will not be exposed to corrosive vapors, abrasive dust, or any other
harmful elements.
2. Regularly lubricate the moving parts in the wheels, arm, handle, and pump roller pin.
3. Replace the automatic transmission fluid (ATF) in the reservoir at least once per year. To check the ATF level, lower
the lift arm completely. Remove the rubber filler plug. The ATF level should be at the bottom of the filler plug hole. If
necessary, add ATF, and install the filler plug. Important: The use of alcohol or hydraulic brake fluid could damage
the seals and result in jack failure.
4. Inspect the jack before each use. Take corrective action if any of the following problems are found:
a. cracked, damaged housing
b. excessive wear, bending, other damage
5. Keep warning labels and instructional decals clean and readable. Use a mild soap solution to wash external surfaces
of the jack.
Repair procedures must be performed in a dirt-free environment by qualified personnel who are familiar with this
equipment. CAUTION: All inspection, maintenance, and repair procedures must be performed when the jack is free
of a load (not in use).
Trouble
Jack does not lift
Jack lifts only partially
Jack advances slowly
Jack lifts load, but doesn't hold
Jack leaks ATF
Jack will not retract
Jack retracts slowly

Preventive Maintenance

c. leaking hydraulic fluid
d. scored, damaged piston rod

Troubleshooting Guide

Cause
1. Release valve is open.
2. Low/no ATF in reservoir.
3. Air-locked system.
4. Load is above capacity of jack.
5. Delivery valve and/or bypass valve not
working correctly.
6. Packing worn out or defective.
1. Too much or not enough ATF.
1. Pump not working correctly.
2. Leaking seals.
1. Cylinder packing is leaking.
2. Valve not working correctly (suction,
delivery, release, or bypass).
3. Air-locked system.
1. Worn or damaged seals.
1. Release valve is closed.
1. Cylinder damaged internally.
2. Return spring is damaged.
3. Link section is binding.
Form No. 106447, sheet 2 of 2, back
1. Close release valve.
2. Fill with ATF and bleed system.
3. Bleed system.
4. Use correct equipment.
5. Clean to remove dirt or foreign matter.
Replace ATF.
6. Replace packing.
1. Check ATF level.
1. Rework pump.
2. Replace seals. (Seal Kit No. 501816 is
available from OTC.)
1. Replace packing.
2. Inspect valves. Clean and repair seat
surfaces. (Repair Kit No. 501235 is
available from OTC.)
3. Bleed system.
1. Replace seals.
1. Open release valve all the way
counterclockwise (CCW). May be
necessary to clean release valve.
1. Send jack to OTC-authorized service
center. (Refer to OTC Form No. 104031.)
2. Replace return spring.
3. Lubricate or replace link section.
e. loose hardware
f. modified equipment
Solution