Section 3
3 - 7
Brake Valve Pressure Check and Adjustment
All installations without optional
DRAG-BRAKE
Test Equipment:
•
(1) 1,000 psi (6,895 kPa) Gauge
•
(1) 5,000 psi (34,474 kPa) Gauge
Connect pressure gauges to:
•
RI (Tee into existing line)
•
TP-BRAKE test port
Instructions
1. With the engine shut off, connect a 1000 psi pressure
gauge to the
TP-BRAKE
pressure test port. Use a
tee and fi ttings as available to connect a 5000 psi
pressure gauge at the
RI
port on the control manifold.
NOTICE
Even though the pressure required for
brake release at RI is low, the actual
pressure sent to that port could be full
supply pressure on some installations.
Use a 5,000 psi gauge.
2. Start dozer and set to high-free idle.
3. Slowly meter the control lever into the
LINE-IN
position while monitoring both gauges.
4. TP-BRAKE
pressure will jump to full pilot supply
pressure when
RI
reaches the pilot setting of the
brake valve.
Table 3-4 Hydraulic Pressure Readings
Dozer
Pressure in
PSI [kPa]
RI
BRAKE RELEASE
PRESSURE
TP-BRAKE
PILOT
PRESSURE
Komatsu
D51-24 (K371)
100-120
[689-827]
300 - 400
[2,068 - 2,758]
CAT
D6K2 T4F (C805)
80-100
[552-689]
400 - 435
[2,758 - 2,999]
CNH
1650M (R42)
80-100
[552-689]
350 - 370
[2,413 - 2,551]
CNH
1150M (R371)
80-100
[552-689]
Liebherr
PR716 (L39)
100-120
[689-827]
290 - 350
[1,999 - 2,413]
5. Check pressure as indicated in Table 3-4. The brake
valve sets the overlap between the hydraulic motor
drive and brake release.
6. A low setting on the brake release valve will release
the brake before the motor begins driving. A high
setting on the brake release valve will momentarily
drive the motor against the brake before the brake
releases.
Brake Valve Adjustment
1. Slowly meter the control lever into the
LINE-IN
position.
2. Measure pressure at
TP-BRAKE
and
RI
pressure
test ports.
3. Loosen brake valve locknut. Turn adjusting capscrew
OUT to decrease pressure and IN to increase
pressure. Adjust pressures as shown in Table 3-4.
NOTICE
The values in Table 3-4 are based on
information available at time of publishing.
Refer to the service/maintenance manual
supplied with your dozer to verify the
available pilot pressure.
Figure 3-8 Test Equipment Setup
1000 PSI Gauge
at TP-BRAKE Port
5000 PSI Gauge
at RI Port
Brake Valve
Summary of Contents for H5C Series
Page 8: ...vi Notes...
Page 48: ...General 1 40 Notes...
Page 59: ...Troubleshooting 2 6 Notes...
Page 77: ...Service 3 18 Notes...
Page 86: ...Section 4 4 9 Intentionally Blank...
Page 104: ...Section 4 4 27 Intentionally Blank...
Page 108: ......
