© 2022 Genesis Attachments, LLC
Genesis GXT Mobile Shear
66
TROUBLE-SHOOTING GUIDE
Symptom
Possible Causes/Solutions
Low power
Check operating pressures and back pressure at port blocks on shear
Isolate shear from excavator and check excavator pressures at boom tip
Shear may be partially stuck in regen mode; follow adjustment procedure in this manual
If speed is good with low power, internal seals on logix cartridge may need to be replaced
Possible cylinder, swivel or regen bypass (contact the Genesis Service Department for
procedures)
Slow jaw open with
low power
Pilot check valves in the regen valve may have worn or damaged seals
Slow jaw close
Check hydraulic flows from excavator
Check regen valve adjustment if shear is new
Adjustment cartridge may have damaged seals or may be stuck open
Regen check valve or logix valve may have damaged seals or may be stuck open
Good speed but shear
stalls before cutting
Regen adjustment cartridge is turned in too far, not shifting out of regen mode
Jaw drifts closed or
can be pushed closed
Regen bleed down orifice may be plugged
Regen pilot check valves may be leaking
Directional valve on excavator may be leaking
Jaw closes suddenly
and will not open
Ball valve may be closed on excavator
Regen pilot check valves may be contaminated
Excavator valve spool may be stuck
If shear has quick-coupled hydraulics, they may be partially disconnected or damaged
Hydraulics chatter
while cutting
Tighten regen adjustment cartridge in quarter-turns and recheck speed
Chattering may indicate a material jam
Jaw bounces back
after hitting excavator
relief on jaw open
Regen bleed down orifice is plugged
Regen logix cartridge needs to be replaced/cylinder or swivel seal failure
Loud bang when
shifting to speed mode
Broken spring or poppet in logix cartridge (regen valve)
Hydraulic system
overheating
Check hydraulic system oil level for low or overfull condition
Ensure clear path for hydraulic cooler-radiator and A/C condenser; clean coolers and radiator
with compressed air and then pressure wash
Check with excavator dealer on whether a hot weather package needs to be installed on
the excavator. Note oil temperatures coming out of the shear can run as high as 230 to 240
degrees Fahrenheit.
