Testing Wheel Brake Oil Pressure - Komatsu WA250-6 Shop Manual

SEN03837-01

Testing wheel brake oil pressure

a Necessary tools
Symbol Part No.
1 793-605-1001 Brake test kit
2 790-101-1430 Coupler
3 790-101-1102 Pump
S 4 790-301-1720 Adapter
5 799-101-5160 Nipple
6 799-401-2220 Hose
7 790-261-1130 Coupling
T 793-463-1100 Stopper
k
Stop the machine on a level ground, lower
the work equipment to the ground, and set
chocks under the tire securely.
k
Apply the parking brake and put chocks
under the tires securely.
a Measure the oil pressure of the front brakes
(right and left) and rear brakes (right and left)
similarly.
a Measuring condition.
Engine coolant temperature: Within oper-
q
ating range
Hydraulic oil temperature: Within operat-
q
ing range
1. Remove front frame inspection cover (1).
k
When raising the lift arm to remove the
inspection cover, place a stand [1]
under it to support securely.
Instead, you may set stopper T to the
lift arm cylinder to prevent the work
equipment from lowering.
22
30-120
1
Part Name
120 Testing and adjusting, Part 2

Testing wheel brake oil pressure

2. Remove brake tube (2) of the measured side.
a The right side is shown as an example in
the figure.
3. Remove union (3) and install adapter S4 and
nipple S5.
a Use the O-ring fitted to the union.
4. Connect brake test kit S1 to nipple S5.
a For the composition and connection, see
the figure on the following page.
5. Connect hose [1] and loosen bleeder screw (4)
to bleed air.
a Operate tool S3 to bleed air.
WA250, 250PZ-6