THE ART OF DUMPING PAYLOAD WITHOUT DAMAGE
Dump truck drivers must become a very special breed of driver. In addition to know-how in transporting your payloads,
you have to know a lot of tricks of the trade of loading and dumping.
The users of the CCE-IHC Dump Trucks have been complaining of damage to rear air brake lines and damage to the rear
axles' aluminum brake chamber housings. Here is guidance on how to avoid a lot of these problems and how to operate
your trucks to prevent rear axle brake damage.
Since the CCE-IHC Dump Trucks have a higher gross vehicle weight rating (GVWR) than most other vehicles, and about
60 percent higher than the replaced N-Series Dump Truck, the brakes on the CCE-IHC dumps must have high stopping
power and high parking power. To achieve this power, these heavy trucks have large, type 30 brake chambers with
heavy coiled springs at each wheel brake. Thus, when the loaded truck is parked, all four rear tandem wheels are locked
tightly to hold the 71,000 GVWR. While lighter trucks can get by with only two, spring brake chambers on the forward
tandem, heavy trucks need to be equipped with four spring chambers. Both rear tandem axle chambers stick out
rearward beyond the tires and are subject to getting damaged during backing and dumping of payloads.
TARCOM EIR Case No. DE37-1208-01 notes that users are troubled with breaking the air line fittings (the service brake
application air line and the emergency parking brake air line) off the rear air brake chambers when backing the dump
truck. The air brake lines and fittings on both the front as well as the rear tandem axles should be attached in the upper
half of the chamber cans and on the side next to the truck frame. This is the most protected, safe position to prevent
damage. To position the air lines, locate the service brake chamber clamp, clean the area, and loosen (but don't remove)
the clamp. Then, rotate the spring brake housing of the air chamber so that the fittings and lines do not protrude
downward. Finally, test drive the truck through a ditch to see that the lines don't chafe on the suspension when the axles
are fully articulated. If necessary to reaim the lines, use only straight to 45 ° fittings. The 90 ° fittings will restrict air flow too
much in flowing in and out of the brake chambers.
The CCE-IHC dumper carries twice the volume of payload that the replaced M-Series GI Truck carried, so you will have to
allow for more space to dump your payload. If you don't, your payload could damage your truck. Since you have a 16-
foot long, Thiele Dump Body, the wisest thing to do is to commence dumping with the truck in neutral (N) main
transmission range and your auk box in the underdrive.(UD), low gear.