Chapter 9. Hydraulic System Diagram - BOXER BHM195 Series Manual

Model
Structure weight (kg)
Max digging depth (m) A
Max digging radius (m) B
Max digging height (m) C
Max unloading height (m) D
Stabilizer width (m)
Swing angle for boom
Bucket turning angle
Bucket turning angle
Bucket width (mm)
Min. hydraulic flow req.
Max. hydraulic flow allowed
Min. hydraulic press. Allowed.
Bucket digging force (kg)
Dipper arm digging force (kg)
Item
Hydraulic System Oil Level
Hydraulic System Oil/Filter
Tyre Inflation
Backhoe Pivot Points
Backhoe Hydraulic Lines, Hoses,
Connections
Boom, Arm, Swing and Bucket
cylinder rod packing's
Pivot Pin Bolts and Dust Covers
Pin Wear
Backhoe Mount Hardware
Structural Bolts and Nuts
PROBLEM
Stabilizer Legs, Swing, Boom, Dipper
Arm and Bucket Cylinders not
working
1—2 to bucket cylinder 3—4 to arm cylinder 5—6 to right stabilizer cylinder 7—8 to left stabilizer cylinder 9—10 to swing
cylinder 11—12 to boom cylinder 13 out oil 14 in oil
PROBLEM
Stabilizer Legs, Swing, Boom, Dipper
Arm and Bucket Cylinders not
working
Cylinders operate in wrong direction
relative to control valve lever
position.
BHM-195
540
1.95
2.9
3.17
2
1.7
180
195
0.02
15L/MIN
25L/MIN
13MPA
16MPA
1100
850
Service
Check
Replace
Check
Lubricate / Grease
Check for leaks, wear
Check for seepage, service as
needed
Check, replace if missing
Check, replace if necessary
Check visually
Re-torque
Possible Cause
Low hydraulic fluid level
Hydraulic hoses connected
improperly
Hydraulic hoses to / from control
valve blocked
Backhoe control valve or tractor
main relief valve stuck open
Lower system pressure supplied
from hydraulic pump
Control valve linkage broken
Quick disconnected coupler(s) are
not fully connected or "flow Check"
Possible Cause
Hydraulic Hose or tube line blockage
Cylinder piston assembly defective
(not sealing)
[28]
Control Valve blockage
Safety lock pins (2) not removed
Stabilizer legs safety clip not released
Hydraulic Hoses connected
incorrectly.
Low hydraulic fluid level
Cold hydraulic fluid
BHL-225
700
2.25
3.3
3.45
2.3
1.7
180
203
0.035
25L/MIN
40L/MIN
13MPA
16MPA
1700
1100
Service Interval
Daily / 10 Hours
Every 50 Hours
Weekly / 50 Hours
Daily / 10 Hours
Daily / 10 Hours
Daily / 10 Hours
Daily / 10 Hours
Daily / 10 Hours
Daily / 10 Hours
Every 25 Hours
Correction
Check and replenish hydraulic
fluid.
Check and correct hydraulic hose
connections.
Check for damage (kinked) hoses,
etc.
Check system pressure, repair or
replace relief valve. Refer to the
tractor Operator's Manual.
Check system pressure. Repair or
replace pump.
Inspect. Repair as required.
Check coupler connections.
Replace coupler(s) if necessary.
Correction
Check for evidence of damage to
hoses or tube lines that would block
flow of oil between cylinders and
control valve
Check cylinder for internal leakage as
described in service section under
cylinder leakage tests.
Inspect for blockage. Disassemble
valve if necessary.
Remove and store safety pins.
Release the clip
Correct hydraulic hoses connections.
Check and replenish hydraulic fluid.
Allow hydraulic system to warm up