Weaver WA-72B Operation manual

WA-72B, WA-73B,
WA-75B, & WA-85
OPERATION & SERVICE
INSTRUCTIONS
Weaver Jack Corporaon
343 Lawrence Street
Adrian, MI 49221
[phone]

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 Specicaons
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 unl no oil seeps out; they
only need to be moderately ght.

Operaon of a Weaver Jack
WARNING! Always use stands to support the vehicle before aempng under-
vehicle repairs or inspecons. Always follow OSHA Workplace Safety Standards.
1. Use the jacks on a smooth, hard, level surface only. Use the jack as a liing 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 troubleshoong secon.
3. The jack is easily maneuvered by depressing the handle lock lever unl the lock
rod engages one of the two handle posions, and then pivong the jack on its
rear casters.
4. Place the jack in posion so that the saddle will engage an approved liing 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 oen 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 twisng of the frame. The load should
be centered in the saddle.
5. Pump with the handle for easy liing. Do not aempt 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 unintenonal operaon of the
release lever.

Relling 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 specicaons) unl the level comes
up to within 1/4” to 3/8” below the ller hole.
 Overlling will cause oil to squirt out of the vent hole as the jack is lowered, or
may prevent the jack from lowering properly.
 Insucient 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 Protecon
The lowering valve (release valve) is also designed to work as an overload protec-
on device. If you aempt to raise a load that exceeds the jack’s rated capacity,
this valve will automacally release the cylinder pressure as an overload protec-
on safety feature.

Safety Precauons
 Follow OSHA Standards and ASME PALD Part 10 Instrucons.
 Never exceed the jack’s rated load capacity.
 Only li vehicles at the recommended li points found in the vehicle’s service
manual.
 Eye protecon should be worn per OSHA recommendaons.
 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 modicaons to the jack in any way.
 Always use jack stands under the vehicle and stay clear when liing or lowering
the vehicle.
Preventave Maintenance
 Inspect the jack before each use. Take correcve acon 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 inspecon 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 operaon.

Troubleshoong
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 overlled with oil.
Jack will only li part of the way up: 1. It may be low on oil; check and rell.
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 obstrucons.
The load rises on the down stroke
of the handle and then immediately
seles 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 obstrucons.
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 seles back down while forc-
ing the hand back up:
1. The jack may be air-bound.

Release Valve Group and Ball Valve Assembly Derail

Ball Valve Replacement
1. Remove the ball chamber plug (V).
2. Remove the two balls (X&Z) and the ball weight (Y).
3. Reassemble with the two new balls (X&Z), new plug gasket (W), and exisng
ball weight (Y) between the two balls.
Note: Whenever it is necessary to loosen or remove the ball chamber plug, the
gasket (W) should be replaced with a new one. Oil leakage at this point is usually
caused by trying to reuse an old gasket.
Ball Valve Test
1. If the jack will not raise at all, the ball valve may be obstructed by debris.
2. Open the release valve and keep it open.
3. Raise the saddle li arm manually to full height.
4. Lower the saddle by pushing it all the way down (this will ush out any debris in
the ball seats).
5. Close the release valve and try to pump up the jack.
6. If it now will raise and hold, then the ball valve may need to be serviced.

Release Valve Group (Upper) and Pump Assembly (Lower)

Release Group Needle Valve Adjustment
In the release group assembly, the spring governs the load that the jack will li.
When the pressure within the cylinder overcomes the spring tension, the release
valve oats o the seat. It is imperave that the release valve oats freely in the
release group assembly. To check: use your forenger and thumb to grasp the re-
lease valve where the release clevis pin passes through and wiggle it from side to
side. There should be a minimum of .002 to .004 clearance in the release valve
guide (OO). If no movement is noted, follow the steps below:
1. Measure the distance from the bracket (O) to the rst nut (P) on the compres-
sion spring accurately and write it down (approximately two inches).
2. Remove nuts (P&Q), the spring, the valve rod (N), and the valve guide (OO). It
is not necessary to loosen the packing nut.
3. Insert the valve rod (N) through the bracket’s (O) opening.
4. Slide the release valve guide (OO) onto the rod, but not seated in the hole, and
insert the rod (N) into the packing nut’s (R) opening.
5. Gently tap the end of the release rod (N) with a hammer unl it stays rmly
seated in the internal needle seat.
6. Slide the release valve guide (OO) towards the bracket (O). Normally it will t
smoothly into the bracket hole. Note where the center alignment of the rod in
the bracket hole is o. Tap the welded bracket accordingly with a hammer to
gently bend the bracket and correct the misalignment. It is in alignment when
you can smoothly slide the valve guide into the bracket’s hole.
7. Reassemble the release valve and parts.
8. Tighten the adjusng nut (P) to the original dimension you wrote down in step
1 and lock this with nut (Q).
9. Test the jack for proper operaon.