The Multiquip 100KDO75505 Packing Upper ST-4125 is a genuine OEM component designed for the ST-4125 swing tube concrete pump. Sourced directly from Multiquip, this part meets the exact material and dimensional specifications of the original, ensuring a correct, drop-in fit for the ST-4125. Keeping the upper packing in good condition is essential to maintaining pump output pressure and preventing material bypass within the pumping cylinder. If you are servicing or rebuilding your ST-4125, the part is the correct OEM replacement to restore full pumping performance.
Key Features
- Genuine OEM Material Grade — Manufactured to Multiquip's original packing material specifications, ensuring correct compression characteristics and resistance to abrasive concrete slurry.
- Direct Cylinder Fit for ST-4125 — Engineered to seat precisely within the ST-4125 pumping cylinder assembly, allowing straightforward installation during routine service or rebuild work.
- Confirmed ST-4125 Fitment — Verified for use on the Multiquip ST-4125 swing tube concrete pump. Always confirm your model before ordering.
- Maintains Pumping Pressure — A correctly seated upper packing holds cylinder pressure during each stroke, sustaining consistent concrete delivery and preventing premature pump wear.
- Sealing Integrity Under Load — Worn or degraded packing allows concrete paste to bypass the piston, creating pressure loss and potential cylinder damage — replacing with the correct OEM part restores proper sealing under working load.
The upper packing is a sealing component located within the pumping cylinder of a concrete pump. Its role is to form a tight, pressure-resistant seal around the piston as it strokes through the cylinder, pushing concrete through the discharge line. When the packing wears or hardens over time, pressure escapes past the seal, causing reduced output, inconsistent flow, and accelerated wear on surrounding cylinder components. Replacing the upper packing with the correct OEM part — such as Multiquip 100KDO75505 — restores the hydraulic seal integrity the ST-4125 depends on for efficient, continuous concrete placement.
Part Details
| Part Number | 100KDO75505 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Packing Upper ST-4125 |
Compatibility & Fitment
| Name | Model |
|---|---|
| ST-4125 | ST-4125 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
