Return-line filter is sold separately.
The Buyers Products SMR37SQ 37-gallon side-mount hydraulic reservoir provides oil storage for truck and trailer hydraulic systems, including dump applications. Its welded mounting brackets attach at the truck frame, while the square tank layout measures 23 inches high by 23 inches wide by 22 inches deep.
The reservoir combines 12-gauge HRPO carbon steel with a black powder-coated finish for corrosion resistance. Internal baffling separates the suction and discharge areas to help oil circulate and cool. Choose the tank around your hydraulic system's oil requirements, mounting space and line connections.
Fluid storage with accessible service features
The removable cleanout cover provides access for reservoir maintenance. A magnetic drain plug and sump help collect metallic contamination, while the included filler breather incorporates a wire basket strainer. The sight gauge lets you check oil level at the tank.
| Feature |
Benefit |
| Welded integral mounting brackets |
Provide mounting points for a side-of-frame installation. |
| Internal baffle |
Separates suction and discharge areas to support oil circulation and cooling. |
| Magnetic drain plug with sump |
Helps collect metallic particles during reservoir service. |
| Removable cleanout cover |
Provides access to the reservoir interior for cleaning. |
| Top-mounted filter provision |
Accepts an HFA5-series return filter without using space for a separate external filter housing. |
Technical specifications
| Specification |
Detail |
| Manufacturer part number |
SMR37SQ |
| Capacity / usable capacity |
37 gal / 37 gal |
| Dimensions |
23 in. H × 23 in. W × 22 in. D |
| Construction |
12-gauge HRPO carbon steel |
| Finish |
Black powder coat |
| Mount position |
Side mount with integral welded brackets |
| Suction connection |
One 2 in. NPT port |
| Return connection |
1-1/4 in. NPT |
| Load-sensing pump drain connection |
3/4 in. NPT |
| Additional port size |
1/2 in. NPT |
| Gauges |
Oil level and temperature indication |
Included equipment and filter selection
The tank includes its filler breather, strainer, gauge and magnetic drain plug. The return filter remains a separate selection: match the filter assembly and element to the required return flow and filtration for the hydraulic system.
| Component |
Selection or inclusion |
| Reservoir assembly |
Includes internal baffling, integral brackets and removable cleanout cover. |
| Filler breather |
Quarter-turn chrome filler breather with wire basket strainer included. |
| Gauge and drain plug |
Oil level/temperature gauge and magnetic drain plug included. |
| Return-line filter |
Not included. Tank accepts an HFA5-series top-mounted return filter. |
Before ordering
| Check |
Requirement |
| Tank capacity |
Confirm that 37 gal of usable capacity meets the hydraulic system requirements. |
| Frame and clearance |
Check the mounting location against the 23 × 23 × 22 in. tank dimensions and leave access for filling, the cover and filter service. |
| Hose connections |
Match the 2 in. NPT suction, 1-1/4 in. NPT return and 3/4 in. NPT pump-drain connections to your plumbing. |
| Filter and mounting plan |
Select the return filter separately and confirm the required frame fasteners and mounting arrangement before installation. |
Need help selecting a side-mount hydraulic reservoir? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your application, available mounting space and hydraulic connection sizes.
