320 GC Excavator DKJ00001-UP (MACHINE) POWERED BY C4.4 Engine(M0085277...
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Product: EXCAVATOR
Model: 320 GC EXCAVATOR DKJ
Configuration: 320 GC Excavator DKJ00001-UP (MACHINE) POWERED BY C4.4 Engine
Testing and Adjusting
320 GC, 320 and 323 Excavator Machine Systems
Media Number -M0086563-01 Publication Date -01/03/2018 Date Updated -12/03/2018
i07350405
Specifications
SMCS - 5050
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320 GC Excavator DKJ00001-UP (MACHINE) POWERED BY C4.4 Engine(M0085277... Page 2 of 4
Illustration 1 g06194599
Relief valve locations
(1) Main relief valve
(2) Boom cylinder line (head end)
(3) Boom cylinder line (rod end)
(4) Stick cylinder line (head end)
(5) Stick cylinder line (rod end)
(6) Bucket cylinder line (head end)
(7) Bucket cylinder line (rod end)
(8) Swing (right)
(9) Swing (left)
(10) Left travel crossover relief valve for forward travel (upper valve)
(11) Left travel crossover relief valve for reverse travel (lower valve)
(12) Right travel crossover relief valve for forward travel (upper valve)
(13) Right travel crossover relief valve for reverse travel (lower valve)
(14) Pilot relief valve
(15) Main control valve
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320 GC Excavator DKJ00001-UP (MACHINE) POWERED BY C4.4 Engine(M0085277... Page 3 of 4
(16) Travel motor (right)
(17) Travel motor (left)
(18) Swing motor
Table 1
Specifications
Torque for
Relief Valve New
Service Limit(2) Locknut
Rebuilt(1)
Main relief 35000 + 500 - 1000 kPa 35000 + 500 - 2000 kPa 50 ± 10 N·m
valve (5076 + 73 - 145 psi) (5076 + 73 - 290 psi) (37 ± 7 lb ft)
Main relief valve 38000 + 500 - 1000 kPa 38000 + 500 - 2000 kPa 69 ± 10 N·m
(Heavy Lift) (5512 + 73 - 145 psi) (5512 + 73 - 290 psi) (51 ± 7 lb ft)
Boom cylinder
line (head end) 32800 kPa (4757 psi)
41000 ± 500 kPa
VA Boom ( 35800 kPa (5192 psi)
(5947 ± 73 psi)
cylinder line Heavy Lift)
(head end)
Boom cylinder
line (rod end)
VA Boom
38000 ± 500 kPa
cylinder line (rod 32800 kPa (4757 psi)
(5511 ± 73 psi) 20 ± 2 N·m
end)
(14 ± 1 lb ft)
Stick cylinder
line (head end)
32800 kPa (4757 psi)
Stick cylinder 41000 ± 500 kPa
( 35800 kPa (5192 psi)
line (rod end) (5947 ± 73 psi)
Heavy Lift)
Bucket cylinder
line (head end) 38000 ± 500 kPa
32800 kPa (4757 psi)
Bucket cylinder (5511 ± 73 psi)
line (rod end)
Swing relief
pressure (right) 25500 ± 1000 kPa 25500 + 1000 - 2000 kPa 117 ± 10 N·m
Swing relief (3698 ± 145) (3698 + 145 - 290 psi) (85 ± 7 lb ft)
pressure (left)
Left travel 37000 ± 500 kPa 32800 kPa (4757 psi) 92 ± 8 N·m
crossover relief (5366 ± 73 psi) (68 ± 6 lb ft)
valve (forward)
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320 GC Excavator DKJ00001-UP (MACHINE) POWERED BY C4.4 Engine(M0085277... Page 4 of 4
Left travel
crossover relief
valve (reverse)
Right travel
crossover relief
valve (forward)
Right travel
crossover relief
valve (reverse)
Pilot pressure 9.5 ± 1 N·m
4100 ± 300 kPa (595 ± 44 psi)
reducing valve (84 ± 9 lb in)
(1)
A New specification is the performance that can be expected for a new machine. A “Rebuild” specification is the
performance that can be expected after rebuilding the components of a system.
(2)
Performance beyond “Service Limit” specifications is an indication of the following problems: improper adjustment,
wear, damage of relief valves and damage of pumps.
Table 2
Relief Valves Pressure Change With One Turn Of Adjustment Screw
Main valves 14400 kPa (2100 psi)
Line relief valve 24000 kPa (3480 psi)
Swing relief valve 6800 kPa (985 psi)
Travel crossover relief valve 3050 kPa (440 psi)
Pilot pressure reducing valve 11000 kPa (1595 psi)
Note: Pressure values in Table 2 are approximate values. Use a pressure gauge for adjustment.
Note: Normal operations of the engine and pumps are necessary for the pressure adjustments. If the
results of the pressure adjustment are not correct, then check the engine and the pump characteristic
curve. Slow output flow from the pump is an indication of air in the hydraulic system. Make sure that
no air is present in the hydraulic system. Refer to Testing and Adjusting, "Main Hydraulic Pump Air -
Purge".
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