Seal Kit Pre-Shipment Checklist: Machine Model, Part Number, Size and Kit Contents
Most seal kit orders that go wrong do not fail because of the seals. They fail because the information sent with the order was incomplete — a rod measured by eye, a part number copied from a similar machine, or a kit assumed to cover both cylinders. Work through this list before you release an order.
1. Machine and cylinder position
- Brand, model and, where available, the machine serial number.
- Which cylinder: boom, arm, bucket, blade, steering or lift.
- Left or right side, and whether the kit covers one cylinder or a pair.
2. Part number and drawing
- The number marked on the old part, plus a clear photo of the marking and of the whole component.
- The cylinder assembly number or the supplier drawing when the seal marking is no longer readable.
- If there is no number at all, say so upfront and send measured dimensions instead of a guessed equivalent.
3. Measured dimensions
| Item | What to send | Common mistake |
|---|---|---|
| Rod seal | Rod diameter, groove width and depth | Using a nominal cylinder size instead of the measured rod |
| Piston seal | Bore diameter, groove width and depth | Measuring a worn or scored bore |
| Wiper / dust seal | Rod diameter and housing recess | Assuming it matches the rod seal |
| Wear rings | Width, thickness and groove position | Leaving them out of the kit count |
Take dimensions from the actual part or the drawing. Catalogue sizes are a starting point for selection, not a confirmation that the part will fit.
4. Fluid and working conditions
- Hydraulic fluid type, and any additive, contamination or fluid-change history worth noting.
- The working temperature range the equipment actually sees, rather than a single extreme figure.
- Pressure, stroke speed and duty cycle; exposure to dust, mud, water or salt.
- Material choice follows the conditions above. We do not attach one universal low-temperature rating to every application.
5. Kit contents
- List every item you expect: piston seal, rod seal, buffer seal, wiper, wear rings, O-rings and back-up rings.
- Quantity per cylinder, and the number of cylinders the order has to cover.
- Whether spare O-rings or a complete cylinder rebuild set is required, and whether left and right kits differ.
6. Final check before dispatch
- One written confirmation of the model, part number and dimensions against the supplier drawing.
- Photos of the old seals laid out in order of removal, with a ruler or caliper in frame.
- Agreement on the kit list and quantities before production, not after the box arrives.
A note on equipment brands
Mention of equipment brands indicates compatibility-based selection only. VOLGA is not an official authorised distributor or agent for the brands named. Where a part number cannot be verified, we confirm by measured dimensions and drawing before quoting.