How to Assemble a 37 Ton Wood Splitter? | What Manuals Skip

Assembling a 37-ton splitter means bolting on the wheels, tow bar, hydraulic hose, engine, and fluids in the order your model’s manual specifies.

The good news: the sequence stays nearly identical across brands. Here’s how to assemble a 37 ton wood splitter the way the manuals intend, with the torque specs that actually vary.

What Comes In The Crate?

Most 37-ton splitters ship with the engine and hydraulic pump already mounted to the beam, leaving wheels, tow bar, and a hardware kit for you. Remove the crate sides carefully, then check for two shipping extras: plastic bumpers that brace the beam and rubber boots slid over the axles.

Lay out the hardware and compare it against the manual’s parts list before touching a wrench. A missing cotter pin found late is a much bigger headache than one found early. The wedge and beam are always pre-assembled, which accounts for most of that 600-plus pound shipping weight. Some models also ship the engine separate, so look for a crate-within-a-crate.

Have these tools ready before you start: a torque wrench, sockets from 3/8 to 3/4 inch, a rubber mallet, and pliers for cotter pins. A floor jack helps align the beam when you bolt on the tow bar, and penetrating oil saves the day if any threads arrive caked in packing grease.

The Standard Assembly Sequence: Wheels, Tow Bar, Then Hydraulics

The order never changes: get the machine rolling, then stabilize it, then connect the hydraulics. Start with wheels per the NorthStar manual and the Topmaq guide.

1. Slide the wheel onto the axle with the valve stem facing outward, then install the outer bearing, washer, and axle nut.
2. Seat a cotter pin through the axle, spread its legs, and make sure the wheel spins freely. Tap the dust cap on with a rubber mallet.
3. Repeat for the second wheel, then bolt the tow bar to the axle and tank.
4. Connect the outrigger leg if the model has one, then remove the shipping plug from the hydraulic pump and attach the suction hose with its clamp.

One detail to get right: the tire’s DOT directional arrow, if printed, should point with forward rotation. Invert it and the tube sits twisted against the rim, which shows up later as a wobbly slow leak.

That’s the pattern in the manuals. The Topmaq guide confirms the same slotted-nut-and-cotter-pin hub arrangement, and The engine and controls, if shipped separately, bolt onto the beam next, followed by the fluid fills your manual specifies.

The hydraulic pump’s suction hose is the only line you’ll likely have to connect. Match the hose’s collar to the pump’s threads, tighten the clamp so it seats past the barb, and check there’s no debris in the port before threading it on. The engine usually arrives bolted down with the throttle and choke linkages pre-connected. If yours is separate, lift it on with a helper, align the shaft, and torque the mounting bolts to your manual’s spec.

What Torque Values Should You Use?

Don’t take a torque number from a forum. The manuals disagree on purpose: NorthStar’s 90 lb-ft for tow-bar bolts is nearly twice Dosko’s 57 lb-ft, because the axle and bracket designs differ. Use only the number printed in your model’s book.

The same logic applies to specs. A “37-ton” label hides real differences across brands, as the table shows.

Fluid fills follow the exact model too. The hydraulic system is closed, so don’t crack any fitting until the pump is full and the air is bled. Most manuals have you cycle the wedge back and forth a few times to push air out of the lines before the first real split.

If you’re still picking between machines, our tested roundup of 37-ton splitters compares the options side by side.

Finish with the safety pass. Confirm every cotter pin is spread, dust caps are seated, the suction-hose clamp is tight, and the spark arrestor is installed if the manual calls for one. Then fill the hydraulic tank to the dipstick mark and start the engine per the break-in instructions. NorthStar’s 37-ton assembly manual walks through the full sequence, and it’s worth a skim even if you’ve done this before.

Run through the checklist twice: wheels spin free, tow-bar bolts at torque, outrigger leg pinned, suction-hose clamp tight, spark arrestor installed, and no shipping plugs left anywhere. Walk the machine around and listen for rattles before the first split. Assembled in that order, with the right torque in the right places, a 37-ton splitter pays back the afternoon within the first cord of wood.