Troubleshooting - BRADEN BG4A Installation Maintenance And Service Manual

The following troubleshooting section is provided as a general guide. You may also need to contact the Original Equipment
Manufacturer (OEM) for additional information.
If a hoist exhibits any sign of:
- Erratic operation such as poor load control, load creeping down or chattering.
- Unusual noise.
- Gear oil leaks
- A sudden rise in wear particles from oil analysis
The hoist MUST be removed from service until the problem has been corrected. If a hoist has been subjected to a sudden
heavy load (shock-load) or overload, the hoist must be removed from service, disassembled and all internal components
thoroughly inspected for damage. Continued operation with a defect may result in loss of load control, property damage,
injury or death.
TROUBLE
A
The hoist will not lower the load or not
lower the load smoothly.

TROUBLESHOOTING

PROBABLE CAUSE
1. The counterbalance valve cartridge
may be plugged, damaged, or out of
adjustment
2. The friction brake may not be releas-
ing as a result of a defective brake cyl-
inder seal.
NOTE: If the brake cylinder seal is de-
fective you will usually find oil leaking
from the hoist vent plug.
3. Friction brake will not release as a
result of damaged brake discs.
Remove the counterbalance cartridge
from the valve block and inspect. Clean
and reseal as required. Cartridges are
supplied pre-set to the pressure re-
quired for proper hoist operation. Fur-
ther adjustment should not be required
Check brake cylinder seal as follows:
A. Disconnect the brake release tube
from the brake release port. Connect
a hand pump with accurate 0-2000 psi
(13,800 kPa) gauge and shut-off valve
to the fitting in the brake release port.
B. Apply 1000 psi (6,900 kPa) to the
brake. Close shut-off valve and let stand
for five (5) minutes.
C. If there is any loss of pressure in five
(5) minutes, the brake cylinder should
be disassembled for inspection of the
sealing surfaces and replacement of the
seals. Refer to "Brake Cylinder Service"
section of this manual.
Disassemble brake to inspect brake
discs. Refer to "Brake Cylinder Service"
section of this manual.
12
REMEDY