U IHI Progressive Lubrication Block — Trailer & Chassis Distributor
The U IHI lubrication block is a compact progressive metering distributor widely used in trailer, chassis, and mobile equipment lubrication. IsoHiTech supplies IHI-compatible U blocks with 4, 6, 8, 10, or 12 outlets, nominal 0.3 ml/cycle per outlet (cross-port options can double discharge to selected points).
Blocks operate on oil or grease: oil typically ISO VG > 68; grease NLGI #000–#2. Maximum working pressure about 15 MPa (150 kgf/cm² class) for grease service; lower limits apply for oil-only circuits. Cycle rate up to 200 cycles/min (or 60 cycles/min with cycle indicator installed).
Typical part numbers
- 37801-1 — 4 outlets · 0.3 ml/cyc
- 37801-2 — 6 outlets
- 37801-3 — 8 outlets
- 37801-4 — 10 outlets
- 37801-6 — 12 outlets
Working temperature −20 °C to +60 °C. For progressive system overview, see progressive lubrication systems. For IHI pump replacements, browse IHI grease pump or contact us for SK505-class pump pairing.
- Parameter
- Test Video
| P.N. | Description | Discharge | Max Pressure | Max cycle rate | Working Temperature | Grease Number |
| 37801-1 | Four outlets | 0.3ml/cyc | 15Mpa | 200cyc/min Or 60cyc/min (with indicator) | 20 degrees to 60 degrees | Oil > #68 or NLGI #000-#2 |
| 37801-2 | Six outlets | |||||
| 37801-3 | Eight outlets | |||||
| 37801-4 | Ten outlets | |||||
| 37801-6 | 12 outlets |
Small and easy to instalment
The IHI progressive blocks are tiny and can be fixed in any limited position.
Accessories
IHI could provide the cross port to double the discharge and add the indicator pin or switch to count the cycle.
Related Product
Why U IHI Blocks for Trailers & Chassis?
Trailer axles, landing gear, and chassis pivot points need predictable small doses in tight spaces. U IHI blocks pack multiple metering pistons in a short body, mountable on frame rails or near hub assemblies. Progressive action ensures each point receives lubricant in order—ideal when point counts are moderate and maintenance access is limited.
How the IHI U Block Works
- Pump pressurizes the inlet; first piston in the progressive chain meters ~0.3 ml and shifts.
- Pressure transfers to the next piston until all active outlets in the section cycle.
- On pressure relief, pistons reset for the next pump cycle.
Cross-port accessory: A cross bar can combine two outlets to deliver double discharge (≈0.6 ml/cyc) to a heavy pin or fifth-wheel plate while keeping a single progressive sequence.
U IHI vs. Lincoln SSV
| Feature | U IHI block | Lincoln SSV |
|---|---|---|
| Typical discharge | ~0.3 ml/cyc | 0.17–0.25 ml/cyc |
| Max outlets (mono) | 12 | 20 |
| Common industries | Trailer, chassis | General machine tools |
| Cross-port doubling | Yes | Outlet combining |
Both are progressive mono—not dual-line VSG. See VSG dual-line blocks for alternating-line systems.
Selection Guide
- Count lube points on the axle / chassis circuit (include slack adjusters, cam tubes, kingpin).
- Choose outlet count ≥ active points + 1 spare for future taps.
- Confirm lubricant — NLGI #000–#2 grease or oil VG > 68.
- Add indicator pin or switch if remote proof-of-cycle is required (reduces max cycle rate to ~60/min on some configs).
- Pair pump — SK505 or equivalent progressive pump with matching pressure class.
Installation Tips
- Mount with outlets facing downward or sideways per OEM practice to avoid air pockets.
- Use lubrication pipe and pipe clips on all secondary runs.
- Prime system before road release; verify each bearing shows fresh grease in 2–3 cycles.
Accessories
- Cross port — double discharge to one point
- Cycle indicator pin — visual proof of block operation
- Electrical cycle switch — remote monitoring for fleet maintenance
Approximately 150 kgf/cm² (15 MPa) class for grease. Oil circuits may use lower pressure limits—confirm on datasheet.
About 14 kgf start pressure typical for U block progressive sections.
Yes. Use the cross-port accessory to combine two outlets for ~2× ml/cycle at a single bearing.
4, 6, 8, 10, and 12 outlets (37801-1 through 37801-6 series).
Both. Oil: ISO VG > 68. Grease: NLGI #000–#2.
Trailer axles, chassis lubrication, mobile equipment with limited mounting space.