FHM BACKHOE BH 8, Operation And Parts Manual

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Farmer-Helper BH 8 & 9 25 Revision 08 - 2017
Slow or erratic
movement of
Cylinders (Noisy
operation of cylinders)
Low hydraulic fluid level. Check and replenish hydraulic fluid
Cold hydraulic fluid
Allow hydraulic system to warm up
to operating temperature
Hydraulic Oil viscosity too heavy
or Incorrect oil
Check oil number and viscosity,
Refill correct hydraulic oil
Engine R.P.M. too slow (hydraulic
pump R.P.M. too slow) Increase engine speed to obtain
satisfactory backhoe operation
Excessive weight in bucket.
Material weight exceeds maximum
specified backhoe capacity
Reduce material load. (Digging
load)
Control valve linkage
binding/defective
Check control valve linkage and
repair if worn/defective.
Aeration of hydraulic fluid
Refer to "Aeration of Hydraulic
Fluid"
Quick disconnect coupler
restriction or coupler "Flow
checks"
Check coupler connections. Repair
or replace
Hydraulic hose or tube line
restriction (hoses/tube line) kinked
or pinched
Check hoses and tube lines for
evidence of restriction
Boom, Dipperstick or Bucket
cylinder piston assembly leakage Check cylinders for leakage.
Repair as needed
Relief valve erratic or set below
specifications
Check and reset relief valve.
Setting as needed.
Control valve leaking
internally.(hypassing fluid
within valve).
Replace control valve and recheck
operation.
Inadequate lifting
capacity
Engine R.P.M. too slow. Increase engine R.P.M
Excessive load. Material loading
exceeds specified backhoe capacity
Reduce Load
Relief valve setting below
specifications
Check and reset relief valve setting
as needed.
Bucket, Boom and Dipperstick
cylinder piston assembly leakage
Check cylinders for leakage. Repair
as needed
Control valve leaking internally
Replace control valve and recheck
operation
Hydraulic pump defective
Refer to "Hydraulic Pump Capacity
Inadequate".
Aeration of Hydraulic
Fluid(Generally
indicated by foamy
appearance of fluid)
Low hydraulic fluid level
Check and refill hydraulic system
to proper level.
Air leaking into suction side of
hydraulic pump.
Check for loose or defective
connections between reservoir and
hydraulic pump
Hydraulic fluid foaming due to
improper hydraulic oil usage
Refer to Tractor Operator's Manual
and replace hydraulic oil using
recommended hydraulic oil.