EQUIPMENT REQUIRED
Included on the last page of this module is a data sheet
to record the information observed during the hydraulic
brake system check-out procedure. The data sheet
can be removed, copied, and used during the check-
out procedure.
* Steps indicated in this manner should be recorded
on the data sheet for reference.
The following equipment will be necessary to properly
check-out the hydraulic brake circuit:
•
Hydraulic brake schematic, refer to Section “R”
this manual.
•
Calibrated pressure gauges:
> One 0-5000 psi (0-34,475 kPa) range.
> Three 0-3000 psi (0-20,685 kPa) range.
•
One PB6039 female quick disconnect and hose
long enough to reach from brake cabinet to the
inside of the operator’s cab for each gauge.
•
Accumulator charging kit (EB1759 or equiva-
lent) with gauges and dry nitrogen.
BRAKE CIRCUIT ABBREVIATIONS
AA Automatic Apply Pressure
AF2 Accumulator, Front Brake
AF1
Supply Pressure to Brake Valve for
Front Brakes
AR2 Accumulator, Rear Brake
AR1
Supply Pressure to Brake Valve for
Rear Brakes
BF Brake Pressure, Front
BL Brake Lock Apply Pressure
BR Brake Pressure, Rear
CP1
Cavity Plug, One Direction Flow -
No specific function in this application.
CV, CVR,
CVF
Check Valve
DSV High Pressure Shuttle Valve
LS Low Pressure Shuttle Valve
LAP1
Pressure Tap Test Port
Low Accumulator Pressure
LAP2
Low Brake Pressure Switch
N.C., 1850 ±75 psi (12.95 MPa)
NVF Front Accumulator Manual Drain Valve
NVR Rear Accumulator Manual Drain Valve
PK1 Park Brake Release Pressure
PK2 Park Brake Release Pressure
PK3
Park Brake Pressure Switch
N.C., 1250 psi (8.75 MPa)
PR
Brake Lock Pressure Regulator
2000 psi (13.8 MPa)
PSV
Automatic Apply Valve
1650 psi (11.55 MPa)
SP1 Supply Oil Inlet
SV1 Brake Lock Solenoid
SV2 Park Brake Solenoid
T1 Return To Tank
J04025 Brake Circuit Checkout J4-3
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