The device described in the manual is a Gray TAJS-2000 Truck Air Jack Stand.

Function Description

The TAJS-2000 is a pneumatic jack stand designed for lifting and supporting heavy vehicles, particularly trucks. It operates using an air supply to raise and lower a lift post, providing a stable support point for vehicle maintenance and repair. The jack is designed to be used on hard, level surfaces capable of sustaining the load. It can be used individually to lift one side of a vehicle or in pairs to lift an entire end of a vehicle, doubling its effective capacity. A key safety feature is the ability to pin the ram in place and exhaust the air, ensuring stability before any work is performed under the vehicle. The manual emphasizes the importance of proper load placement on the center of the lifting saddle and using the manufacturer's recommended lift points to prevent instability and potential loss of load.

Important Technical Specifications

Capacity at 150 PSI: 15,000 lbs./6,805 kg (each)
Capacity at 200 PSI: 20,000 lbs./9,075 kg (each)
Doubled Capacity: When used in pairs, the capacity is doubled.
Maximum Lift Height: 52 1/2"
Minimum Starting Height: 17 1/2"
Pin Increment Positions: 2 1/2"
Power Travel: 10"
Width: 14"
Length: 22"
Weight: 133 lbs.
Maximum Air Supply: 200 PSI

Usage Features

The TAJS-2000 is designed for ease of use and safety in a professional service environment.

Operation:

Connection: Connect a quick coupler to the control valve and attach an air supply (maximum 200 PSI).
Lifting: Actuate the air control lever to raise the lift post.
Positioning: Position the jack stand(s) under the vehicle at the manufacturer's recommended lift points.
Manual Adjustment: Manually raise the lift post on each unit (if using in pairs) to engage the lift point.
Pinning: Insert the pin into the nearest through hole in the lift post, ensuring it fully engages both sides of the head plate and ram.
Load Engagement: If the lift post is not fully engaged, slowly apply air pressure until it engages the vehicle's lift points. Ensure the lift post saddle cradles and captures the lift point.
Simultaneous Operation (for pairs): The manual provides instructions for connecting two jacks to a single air line using a connector assembly (pipe tee, pipe nipples, male and female disconnects) to operate them simultaneously. However, a warning explicitly states not to connect two jacks to one control valve, as this can lead to loss of control. The simultaneous operation refers to using a single air supply line to feed two separate control valves, allowing for coordinated lifting.
Final Pinning: Once the desired height is achieved, insert the other pin through the hole in the ram and piston post to fully engage both sides of the head plate when lowered.
Stabilization: Slowly release air pressure, ensuring the pin engages fully into both sides of the head plate slots. Before exhausting air pressure, verify the vehicle is level and stable. Fully discharge air pressure from the jack stands.
Safety Check: Before working under the vehicle, re-check that the vehicle is level and stable between the jack stands. If using a single stand, ensure the load is balanced side-to-side.

Safety Instructions Highlighted:

Do not overload (maximum 20,000 lbs./9,075 kg each).
Use only on hard, level surfaces.
No alterations to the product.
Place load on the center of the lifting saddle only; do not use blocks or cribbing.
Use only manufacturer-supplied adapters/attachments.
Never use more than one extension.
Use in pairs for lifting an entire end of a vehicle, or singly for one side.
Lift at vehicle manufacturer's recommended lift points, ensuring the lift point is cradled.
Never work under a vehicle until the ram is properly pinned and air is exhausted.
Do not attempt to raise a partially filled tanker or transport with an unrestrained load.
Do not drive or move the vehicle while it is supported by the jack.

Maintenance Features

The manual outlines a comprehensive maintenance schedule to ensure the longevity and safe operation of the TAJS-2000. All maintenance and inspection procedures must be performed after the jack has been removed from service.

Regular Inspections:

Before each use: Visual inspection for abnormal conditions.
Weekly (for daily use): Regular inspections.
Monthly (for intermittent use): Regular inspections.
Immediately (after abnormal load or shock): Inspect for damage.
Any damaged, worn, or abnormally operating jack must be removed from service until repaired.

Specific Maintenance Tasks:

Controls and Wheels: Ensure all controls operate freely and wheels rotate freely.
Labels: Verify all warning and capacity labels are readable and complete. Clean external surfaces, labels, and decals with a mild soap solution. Avoid getting water into the ram or cylinder area. If water does enter, tip the jack forward (as shown in Figure 1) to allow it to drain from the cylinder. This also serves as a preventative measure when the jack is not in use, especially in environments where water or slush could drain into the cylinder, as corrosion can lead to air leaks and invalidate the warranty.
Lubrication: Lubricate all rotating and sliding portions of the jack monthly.

Structural Inspection:

Ram, Lift Post, Extension Post: Regularly inspect for cracks, chips, or excessive wear. Pinholes should not be elongated.
Pins: Inspect pins for deformities or excessive wear. Pins must fully insert into the posts and ram in all positions.
Ram Movement: The ram should extend and retract smoothly through its full range.
Airlines: Inspect airlines for leaks or kinks and replace defective ones.

Troubleshooting: The manual includes a troubleshooting section for common issues:

Fails to lift load:
- Inadequate air pressure (do not exceed 200 PSI).
- Air line leaks (locate and correct).
- Overloaded (use a larger capacity jack).
Fails to hold load:
- Locking pin not engaged.

If problems persist after troubleshooting, users are instructed to contact Gray's customer service with the model and serial number.

Gray TAJS-2000 - Page 13

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