Methods For Inspecting Performance; Hydraulic Oil Pressure (Main Relief Valve Set Pressure); Travel, Boom, Arm Measuring Method; Travel, Boom, Arm Adjusting Method - Takeuchi TB175W Workshop Manual

STANDARDS FOR JUDGING PERFORMANCE
METHODS FOR INSPECTING PERFOR-
MANCE
Hydraulic Oil Pressure (Main Relief Valve
Set Pressure)
Travel, Boom, Arm
Measuring Method
• Engine
• Hydraulic Oil Temp. : 50~60°C
• Mount the pressure gauge on the pressure detec-
tion port, operate the desired hydraulic circuit and
measure the relief pressure.
Pressure Detection Port
Circuit
Port Position
Boom P1
Arm P2
Travel P1
Adjusting Method
Travel circuit (High pressure set)
1. Loosen the lock nut (1).
2. Fasten the plug (2) until the piston (3) contacts
the surface A of the plug (4).
• Be sure that the plug (4) does not turn together
with the plug (2).
• The tightening torque of the plug (2) is
19.6N·m or less.
• The size B is 4 mm or more.
3. Turn the plug (4) and adjust the set pressure.
• Turn the plug slowly by referring to the pres-
sure gauge.
• The pressure increases by 21.3 MPa at one
turn of the plug.
4. Upon completion of the pressure adjustment,
hold the plug (4) to prevent it from turning and
fasten it with the lock nut (5).
Boom and Arm Circuits (Low pressure set)
5. First, set the travel circuit (high pressure set),
then loosen the plug (2) and adjust the set pres-
sure.
• Turn the plug slowly by referring to the pres-
sure gauge.
• The pressure decreases by 21.3 MPa at one
turn of the plug
6. Upon completion of the pressure adjustment,
hold the plug (2) to prevent it from turning and
fasten it with the lock nut (1).
7. Actuate the relief valve again and confirm that
the set pressure is stable.
: Maximum r.p.m.
Relief
Valve
Size
G1/4
G1/4 R1
G1/4
II-15
SPECIFICATIONS
5 4
A
B
3 2
1
W2B010