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MaYCO LS600p CONCReTe pUMp • OpeRaTiON MaNUaL — Rev. #0 (05/13/13) — page 53
tRAILER MAIntEnAncE
Periodically check the actuator mounting fasteners for 
damage or loosening. Inspect the actuator for worn or 
damaged parts. As you are towing your trailer, be aware 
of any changes in braking quality. This could be an early 
warning of brake or actuator malfunction and requires 
immediate attention. Consult a certified brake specialist to 
make necessary adjustment or repairs
ADJUSTABLE CHANNEL
Your trailer may be equipped with an adjustable channel 
(Figure 62) that allows the coupler to be raised or lowered 
to a desired height. Periodically check the channel bolts 
for damage or loosening.
  WaRNiNg
Failure to maintain proper fluid level in the actuator 
may result in loss of braking action which could cause 
severe property damage, injury or death.
Table 8. Hydraulic Brake Troubleshooting
Symptom
Possible Cause
Solution
No Brakes 
Brake line broken or kinked?
Repair or replace.
Weak Brakes or 
Brakes Pull to  
One Side
Brake lining glazed?
Reburnish or replace.
Trailer overloaded?
Correct weight.
Brake drums scored or 
grooved?
Machine or replace.
Tire pressure correct?
Inflate all tires equally.
Tires unmatched on the 
same axle?
Match tires.
Locking Brakes
Brake components loose, 
bent or broken?
Replace components.
Brake drums out-of-round?
Replace.
Noisy Brakes
System lubricated?
Lubricate.
Brake components correct?
Replace and correct.
Dragging 
Brakes
Brake lining thickness 
incorrect or not adjusted 
correctly?
Install new shoes and 
linings.
Enough brake fluid or correct 
fluid?
Replace rubber parts  
fill with dot 4 fluid.
NOTICE
When replacing channel mounting hardware (nuts, 
bolts and washers), 
NeveR substitute substandard 
hardware. Pay close attention to 
bolt length and grade
ALWAYS use manufacturer's recommended parts 
when replacing channel mounting hardware.
Figure 62. Adjustable Channel
Wheel Bearings
Wheel bearings (Figure 62) must be inspected and 
lubricated once a year or 12,000 miles to insure safe 
operation of your trailer.
If trailer wheel bearings are immersed in water, they must 
be replaced.
If the trailer has not been used for an extended amount 
of time, have the bearings inspected and packed more 
frequently, at least every six months and prior to use.
Follow the steps below to disassemble the wheel hub and 
service the wheel bearings. See Figure 63.
Figure 63. Wheel Hub Components
2" or 2-5/16" BALL
COUPLER
ADJUSTABLE
CHANNEL
5/8" FLAT
WASHER
5/8" X 11" X 5"
BOLT
5/8"
NYLOC
NUT
ADJUSTABLE
CHANNEL
5/8" FLAT
WASHER
5/8"
NYLOC
NUT
5/8" X 11" X 5"
BOLT
3" PINTLE EYE
RING
  DANGER
If trailer wheels are under water for a long period of 
time, wheel bearings may fail. If this is the case, service 
wheel bearings immediately.
The possibility exists of the wheels falling off causing 
equipment damage and severe bodily harm even death!
WHEEL
HUB
BEARING
CUP
BEARING
CUP
BEARING
BEARING
OIL
SEAL
SPINDLE
NUT
SPINDLE
WASHER
COTTER
PIN
DUST
CAP
LUG
NUT