Weaver WA-72B Operation manual
WA-72B, WA-73B,
WA-75B, & WA-85
OPERATION & SERVICE
INSTRUCTIONS
Weaver Jack Corporaon
343 Lawrence Street
Adrian, MI 49221
(517) 263-6500
MODEL CAPACI-
TY
FRONT
WHEELS
SADDLE STYLE
AND SIZE
FRAME
LENGTH
JACK
WEIGHT
WA-72B 2 TONS 2 WHEELS -
4’” DIAMETER
TRIANGULAR OR
ROUND 5” TO 6”
51” 136 LBS
WA-73B 4 TONS 2 WHEELS -
5” DIAMETER
TRIANGULAR OR
ROUND 5” TO 6”
58” 212 LBS
WA-75B 10 TONS 2 WHEELS -
7” DIAMETER
ROUND 9” 66” 356 LBS
WA-85 20 TONS 2 WHEELS -
7” DIAMETER
ROUND 7” 69” 531 LBS
Weaver Jack Model Specicaons
WA-72B
Assembly of a New Weaver Jack
1. Check the handle set screw for ghtness.
2. On the WA-85 only: Remove and discard the vent ller plug. This is very im-
portant, as the vent hole must always be kept open so the jack can “breathe”.
The other models have a breathable vent built into the cap.
3. Loosen the piston ram and pump packing nuts slightly. They are ghtened all
the way down at the factory for shipment. Tighten unl no oil seeps out; they
only need to be moderately ght.
Operaon of a Weaver Jack
WARNING! Always use stands to support the vehicle before aempng under-
vehicle repairs or inspecons. Always follow OSHA Workplace Safety Standards.
1. Use the jacks on a smooth, hard, level surface only. Use the jack as a liing de-
vice only.
2. Test the jack by using the food pedal only to raise the saddle to full height with-
out a load. The pedal should become very ght. If not, check the oil level or
see the troubleshoong secon.
3. The jack is easily maneuvered by depressing the handle lock lever unl the lock
rod engages one of the two handle posions, and then pivong the jack on its
rear casters.
4. Place the jack in posion so that the saddle will engage an approved liing area
of the vehicle. The saddle is raised to the contact point by the foot pedal. Li
the load using the long handle - do not li loads with the foot pedal alone. On
low clearance vehicles, it is oen advantageous to operate the foot pedal by
hand while watching to assure proper saddle contact. The surface on which the
jack rests should be fairly at to prevent twisng of the frame. The load should
be centered in the saddle.
5. Pump with the handle for easy liing. Do not aempt to raise the jack beyond
its travel stops.
6. To lower the load, pull back gently on the release lever. Always lower the load
slowly.
7. Be certain that the area beneath the vehicle is clear before lowering the vehi-
cle. Always use the release lever lock to prevent unintenonal operaon of the
release lever.
Relling the Jack with Oil
Remove the ller plug and with the saddle down, put in AW-32 Light Hydraulic
Oil (or an oil that meets MIL-F-17111 011 specicaons) unl the level comes
up to within 1/4” to 3/8” below the ller hole.
Overlling will cause oil to squirt out of the vent hole as the jack is lowered, or
may prevent the jack from lowering properly.
Insucient oil will cause the jack to li only part of the way up.
Always be sure to put in oil only when the saddle is all the way down.
Be careful not to let any dirt get into the reservoir while the ller plug is out.
*DO NOT USE BRAKE FLUID, TRANSMISSION FLUID, OR ANY OTHER FLUIDS! DO-
ING SO COULD DAMAGE THE SEALS AND CAUSE THE JACK TO FAIL!
Overload Protecon
The lowering valve (release valve) is also designed to work as an overload protec-
on device. If you aempt to raise a load that exceeds the jack’s rated capacity,
this valve will automacally release the cylinder pressure as an overload protec-
on safety feature.
Safety Precauons
Follow OSHA Standards and ASME PALD Part 10 Instrucons.
Never exceed the jack’s rated load capacity.
Only li vehicles at the recommended li points found in the vehicle’s service
manual.
Eye protecon should be worn per OSHA recommendaons.
Always use the jack on a smooth, hard, level surface.
Keep the load centered on the saddle.
Always check the jack prior to each use and do not use jack if any defect is ob-
served.
Do not add accessories or make any modicaons to the jack in any way.
Always use jack stands under the vehicle and stay clear when liing or lowering
the vehicle.
Preventave Maintenance
Inspect the jack before each use. Take correcve acon before using the jack if
a leak or defect is detected.
Keep all working parts thoroughly lubricated. Keep the jack clean. Dirt is the
major cause of jack failure, and all openings should be kept free of debris.
Packing nuts at the piston and pump plunger should be kept moderately ght.
The packing are NOT under high pressure, and should only be ght enough to
prevent leakage.
Keep oil lled to within 1/4” to 3/8” of ll opening. Replace the oil at least
once per year.
Ball valve may be removed for inspecon and cleaning by removing the ball
chamber plug and using a small magnet. Remove the ball and the ball weight.
Important: Whenever it is necessary to loosen or remove the ball chamber
plug, the gasket should be replaced with a new one. Oil leakage at this point is
usually caused by trying to reuse an old gasket over again.
Relieve When Air-Bound
If the oil supply runs too low, the jack may become air-bound and work on only
a half stroke of the handle.
Fill the jack with oil, raise the saddle, and then using the release lever (lowering
lever), lower the saddle while holding the foot pedal depressed. This will ush
out any air in the system, and excess oil may then run out of the vent.
Repeat if necessary.
Be sure to properly ll the jack with oil before returning it to service.
Oil should never cover the piston rod.
If you cannot pump the jack saddle to full height, raise the saddle by hand and
then perform this operaon.
Troubleshoong
ISSUE CORRECTIVE ACTION
Saddle will not raise: 1. Check the oil level.
2. Perform the ball valve test.
Oil spurts out of the vent hole: 1. The jack is overlled with oil.
Jack will only li part of the way up: 1. It may be low on oil; check and rell.
Jack will not li load: 1. Check for proper oil level.
2. If pumping fails to raise the rated load, the lower
ball valve may be leaking, and it should be inspect-
ed for dirt or other obstrucons.
The load rises on the down stroke
of the handle and then immediately
seles back down while forcing the
jack handle back up:
1. The upper ball valve may be leaking, and it should
be inspected for dirt or other obstrucons.
Jack bleeds down while under load: 1. The release handle may not be closed.
2. The release valve may be leaking. Replace the re-
lease valve packing housing O-rings.
3. The release needle valve may need to be adjusted.
Jack only rises on half-stroke, and
then seles back down while forc-
ing the hand back up:
1. The jack may be air-bound.
Release Valve Group and Ball Valve Assembly Derail
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