The Wacker Neuson Hydraulic Brake Actuator is a genuine OEM component designed for the G25, G50, G70, and G85 series skid-mounted and mobile generators, as well as select HI series indirect-fired air heaters and their associated trailer configurations. As a direct OEM replacement, the is manufactured to the same specifications as the original unit, ensuring a correct installation without guesswork. This part also applies to MGT1S and MGT2SD mobile generator trailer assemblies equipped with surge brake systems. When it comes to trailer braking on revenue-critical mobile power equipment, sourcing the correct OEM-verified component keeps your fleet operating safely and legally on the road.
Key Features
- Genuine OEM Hydraulic Actuation Performance — Built to the same pressure and stroke specifications as the original, ensuring the surge brake system engages and releases at the correct threshold — not an approximation.
- Direct Bolt-On Replacement — Matches the original mounting footprint and hydraulic port configuration on the trailer coupler assembly, so installation follows the same procedure as the factory unit.
- Broad Generator and Heater Trailer Fitment — Confirmed fit across G25, G50, G70, and G85 mobile generator series, select HI750 and HI900 indirect-fired air heater trailer configurations, and MGT1S and MGT2SD trailer assemblies.
- Surge Brake System Integrity — A correctly functioning hydraulic brake actuator transfers deceleration force from the coupler to the trailer brakes smoothly and proportionally. A worn or leaking actuator causes delayed or uneven braking, increasing stopping distances and trailer sway under load.
- Road-Legal Trailer Brake Compliance — Trailer surge brake systems on towed generator and heater units are subject to DOT towing regulations. Using a verified OEM actuator supports correct system function and helps maintain compliance during transport inspections.
The hydraulic brake actuator is the core component of a surge-style trailer braking system. When the tow vehicle decelerates, the coupler compresses against the actuator, which converts that mechanical force into hydraulic pressure and applies the trailer brakes in proportion to the deceleration. This self-regulating action requires no electrical connection to the tow vehicle. When the actuator seal fails or the internal piston corrodes, brake engagement becomes inconsistent or fails entirely — a serious safety concern when towing heavy generator or heater trailer loads on public roads. Replacing a worn actuator with a genuine OEM unit restores the correct actuation force and hydraulic response the system was engineered to deliver.
Part Details
| Part Number | 5000155883 |
|---|---|
| Old Part Number | 0155883 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Hydraulic Brake Actuator |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| Skid-mounted Mobile Generator, Custom | G70 | 5000620352, 5000620350, 5000620351, 5000009367, 5000009468, 5000620002, 5000620647, 5000620711, 5000620646, 5200001318, 5200003220, 5200006879, 5200003975, 5200003973, 5200003974, 5200014464, 5000009260, 5200004151, 5200014463, 5200014465, 5200008344, 5200008342, 5200008343, 5200008339, 5200008719, 5200008340, 5000009464, 5100025262, 5000009478, 5100025838 |
| Skid-mounted Mobile Generator | G50 | 5000009467, 5000009366, 5000620001, 5200001062, 5200001063, 5200006878, 5200001317, 5200001060, 5200001061, 5200014322, 5000009259, 5200014319, 5200014320, 5200014323, 5200017829, 5200022589, 5100042434, 5200017830, 5100042430, 5100042435, 5000620710, 5100045494, 5000620964, 5000620965, 5000620966, 5100042431, 5100042433, 5100045085, 5100045493, 5100042432, 5000009463, 5000009477, 5100025812, 5100026954, 5100029210, 5100026955, 5100026956 |
| Mobile Generator, Custom | G25 | 5000620346, 5000620344, 5000620345, 5000620642, 5000009466, 5000620004, 5000620640, 5000620709, 5000620641, 5000009368, 5200005557, 5200003991, 5000620931, 5200001316, 5200014461, 5000009258, 5200014460, 5200014462, 5000621005, 5000620706, 5100022834, 5000009462, 5000009476, 5100042507, 5100042510, 5100042512, 5100042509, 5100025836, 5100042508 |
| Mobile Generator | G85 | 5000009459, 5000620003, 5000009369, 5000009310, 5000009305, 5000009465 |
| HI750 DGM,SB HEATER-INDIRECT | HI750GM | 5000620930 |
| HI 750GM HD-Mobile Indirect Ai r Heater-Surge, -40 | HI750GMHD | 5000620969 |
| HI750G HEATER-INDIRECT | HI750G | 5000620857 |
| Factory-Installed Options | Factory-Installed Options | 5200004152 |
| MGT1S Mobile Generator Trailer, Surge, Pintle Hitch | MGT1S | 5000009299, 5200006715 |
| MGT2S Mobile Generator Trailer, Surge, 6000LB Axle | MGT2S | 5000009301 |
| Mobile Indirect Fired Air Heat er, Diesel w/Genset | CUB700GM | 5000620759 |
| MGT2SD Trailer, Surge, Dual Axle, 3500LB Each | MGT2SD | 5000009303, 5000620748, 5000620932, 5200001325 |
| Mobile Indirect Fired Air Heat er, Diesel | CUB700M | 5000620758 |
| HI900 Heater-DGM,Srg,-40 | HI900DGM | 5200014221, 5200014166 |
| Mobile Air Heater Trailer, sin gle axle | Trailer-CUB700M | 5000620682 |
| Mobile Air Heater Trailer, dou ble axle | Trailer-CUB700GM | 5000620683 |
| MGT1S Trailer, Surge, Pintle Hitch | MGT 1S | 5200001324 |
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.
Wacker Neuson
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Wacker Neuson