Mounting Instructions (SEE DIAGRAM PAGE 3)
Attach the “B” brackets (4” long angle brackets with slots in them, shipped loose) to the
backside of the jack’s plates using the 7/16”hardware, two 7/16”bolts per bracket is
OK, B-bracket face with slot to back of jack mounting plate for adjustability. Brackets
will form a clamping design to the trailer frame’s bulkhead (vertical, rectangular frame
section exposed on front of trailer). If no bulkhead, bolt jack directly to frame and
bypass the “B” brackets all together with supplied 7/16” bolts (4 per jack minimum) or
two to four 1/2" or 5/8”bolts (not included).
Level trailer (typical ride height) and support front of the trailer with jack stands.
Unbolt and remove existing jack (and brackets).
Set the Bigfoot jack temporarily to desired placement.
(Recommended Ground Clearance: Minimum of 8 inches, typically match old jack height)
Make sure new jack is level then mark placement of mounting holes on the frame also
called the bulkhead (rectangular frame).
If existing holes in bulkhead do not match the Bigfoot jack’s hole pattern, drill holes
using a 17/32 drill bit.
Then bolt the jack assembly to the bulkhead frame of the trailer using the 5 ½” & 6 ½”
long bolts (½” hardware). Tighten to 70 ft/lbs.
Plumbing of hydraulic lines:
1pt or Drive Leg: If the tank hoses are not already connected to the leg, the left fitting
on the tank assembly goes to the bottom fitting on the Bigfoot Jack, (the longest hose.)
2pt Slave Legs: Install “T” fittings at the drive leg’s ports, run the short hoses from the
tank assembly to the “T” fittings, run the longer hoses to the slave or driven leg.
Recommended Hydraulic Line Bleeding Process:
Prior to hooking up both slave leg hydraulic lines; install the retract line only, leave the
extend line un-attached at the slave leg and place the line in a container (the same container
used for filling the reservoir works well). After filling the reservoir and installing the controls
and power (may be temporary), press the extend button on the control to extend the jacks
for a moment until the container starts to be filled with the fluid from the slave leg’s extend
line. This means all the air is removed from that line and cannot be internally trapped in the
system. Install the extend line to the slave leg and continue to run the jacks to full extension
and leave for a moment (typically 15 minutes) and back down again. After doing so, top off the
hydraulic reservoir and process complete!
