The Western 25861K Gasket provides a crucial fluid barrier on older Isarmatic pump assemblies. Specifically, this original replacement seal prevents fluid migration into the motor electrical compartment. Plowing operations create constant high-frequency vibration during severe winter storms. Consequently, a degraded gasket leads to immediate component contamination and system failure.
Furthermore, this heavy-duty composite seal maintains its structural shape under extreme plowing conditions. Because fluid bypass causes costly pump motor failure, proactive fleet replacement reduces emergency roadside upkeep hours. Additionally, mechanics install this part easily during routine winter maintenance overhauls. Ultimately, using genuine equipment guarantees leak-free operation and protects major fleet investments.
Benefits of the 25861K Hydraulic Pump Motor Housing Gasket
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Seals the interface tightly between the electric motor flange and the hydraulic manifold housing.
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Prevents expensive system damage by stopping hydraulic oil from leaking into electrical motor components.
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Withstands extreme sub-zero fluid temperatures without cracking or losing compression thickness over long shifts.
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Fits classic Isarmatic and SEHP cable or electric solenoid power packs perfectly for fast fleet servicing.
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Restores airtight containment to eliminate fluid waste and reduce unexpected breakdown downtime.
Additional Info and Common Related Parts
| Part Number | Item Name | Technical Role |
| 56291 | Cover Assembly | Protects the exterior pump elements and encloses the power pack assembly. |
| 25618 | Base Lug O-Ring | Seals secondary base ports to maintain fluid pressure alongside the main motor gasket. |
| 49014 | Oil Seal | Prevents high-velocity hydraulic fluid from escaping past the internal drive shaft. |
Always refer to your Western Plow’s documentation and vehicle-specific installation instructions to confirm compatibility and proper installation procedures.




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