The Multiquip 820373 Preheat Module HHN-34TVDTCSL5 is a genuine OEM component designed for the HHN-34 series ride-on mechanical trowel. Sourced directly from Multiquip, this part meets the exact electrical specifications required for proper cold-start operation on HHN-34 equipment. If your trowel is experiencing hard starts, extended cranking times, or glow plug system faults, a failed preheat module is a common cause — and 820373 is the correct OEM replacement to restore normal function.
Key Features
- OEM-Matched Electrical Output — Manufactured to the exact resistance and timing specification of the original module, ensuring the glow plug circuit activates and cuts out at the correct intervals.
- Direct-Fit for HHN-34 Trowels — Engineered specifically for the HHN-34 ride-on mechanical trowel series; connects directly to the existing wiring harness with no adaptation needed.
- Restores Cold-Start Reliability — A functioning preheat module brings diesel combustion temperatures up before cranking, allowing the engine to fire cleanly in cold or cool conditions.
- Genuine Multiquip OEM Part — Supplied as original equipment, this module carries the same part number — 820373 — used by Multiquip dealers and service technicians for HHN-34 repairs.
- Protects Engine from Hard-Start Wear — Repeated cold-cranking without proper preheating accelerates cylinder and injector wear; replacing a failed module protects long-term engine condition.
The preheat module controls the glow plug circuit on diesel-powered equipment, sending current to the glow plugs for a timed interval before and during engine cranking. This raises combustion chamber temperature so the diesel fuel ignites reliably, particularly in cold ambient conditions. When the module fails, the glow plugs may not activate at all — resulting in hard starts, white smoke on startup, or a no-start condition that can be misdiagnosed as a fuel or compression issue.
Part Details
| Part Number | 820373 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Preheat Module HHN-34TVDTCSL5 |
Compatibility & Fitment
| Name | Model |
|---|---|
| HHN-34 | HHN-34 |
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.
