Grout Machine Trailer - Strong GR4 Procedures Manual

Grout Machine Trailer

The trailer is equipped with 6000-pound capacity axles with brakes on both axles, electric brakes are
standard, however, hydraulic brakes may be furnished on request. The standard hitch is a 2-5/16"
diameter ball with option for Lunette eye. Tires are 235/85 R16 L.R.E. radials. Trailer weight with
equipment is approximately 8800 pounds.
The trailer is equipped with a breakaway safety switch with electric brakes. For hydraulic surge brakes a
small chain is attached to some point on tow truck hitch line with and behind the ball hitch. This should
only have a small amount off slack in cable so that in the event of the trailer disconnecting, the chain will
actuate the master cylinder thus applying full brakes at shortest possible travel. For electric brakes the
safety switch has a small cable to connect to tow truck that will pull a plug in electrical switch located at
front end of trailer. Before moving trailer onto road or highway, the system should be checked to see if
operating properly. To do this, pull the safety cable that attached to towing truck. For either electric or
hydraulic surge brakes, this should cause the wheels on the trailer to lock and prevent wheels from turning
when towing truck pulls on trailer. If brakes fail to lock, check system for cause.
If hydraulically operated, check master cylinder on surge hitch for proper fluid level. Refill and bleed as
with any hydraulic brakes system, until brakes are operating satisfactorily. When bleeding system, start
on wheel cylinder farthest from the master cylinder. Release sufficient fluid to assure that all air is
removed from the line. Then bleed each wheel cylinder. When properly operating, the pressure applied
to the master cylinder will indicate a firm "pedal" when brakes are applied. If "spongy", it indicates air is
still in the line. When necessary to add brake fluid, a careful check should be made to see if any lines or
connections are leaking, or a wheel cylinder is leaking. When holding a firm pressure on the master
cylinder, if these is a leak in the system, then the master cylinder will depress or move slowly. Replace
lines, connections or wheel cylinders when leaking. If no leaks are found but the brakes still do not
function after the bleed, then the probable cause is in the master cylinder. The master cylinder should be
checked monthly and refilled with a good brand of brake fluid, same as used in towing vehicle.
When trouble exists in the electrical brake system it is generally caused by bad electrical connections.
Check the electrical plug on the rear of the towing vehicle with a test light or preferably with a voltmeter.
When moving the hand lever on the actuator in the cab of the tow truck a current should be produced.
The current should increase when moving the hand lever. If no current is indicated, trouble is in tow
vehicle. If a current is at the connection from the truck to the trailer and no brakes, check prongs on the
electrical connector and spread open with the blade of a pocket knife to cause firm contact in plug. Check
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