SkyTrak 6036 Service Manual - Manual (Page 159)

8-7 6036, 6042, 8042, 10042, 10054
Hydraulic System
Test Site Hydraulic Pump Flow Test
1
To check flow readings, a flow meter capable of measuring 60 gpm (3,8 liter/sec) and a load
valve capable of 6000 psi (413,4 bar) will be required. — 2000 psi (137,8 bar) load @ Engine
Speed of 2475–2525 rpm—Flow rate should be 28–32 GPM (1,8–2,0 liter/sec)
Test
Site
Valve
Port
Adj.
Site Component
Description
Pressure
Reading
Pressure Test Procedures
2 VG A
Unloader
Valve
Main System
Relief
2900–3100 psi
(200–214 bar)
With engine at idle, use the boom control lever to fully retract the
boom. Hold over relief and check pressure. If pressure is
incorrect, adjust or replace cartridge.
2 B
Unloader
Valve
Lift/Lower Relief
2900–3100 psi
(200–214 bar)
Remove attachment if equipped. With the engine at full throttle,
use the boom control lever to lower boom fully. Hold over
relief and check pressure. If pressure is incorrect, adjust or
replace cartridge.
2 VG D
Unloader
Valve
Standby
Pressure
250-300 psi
(17–21 bar)
With engine at idle and no functions operated, check standby
pressure. If pressure is incorrect, adjust or replace the
differential pressure sense cartridge on the unloader valve.
3 LSG N/A
Unloader
Valve
Load Sense
0-3000 psi
(0-207 bar)
With engine at idle, load sense at 0 psi. With engine at
FULL throttle, use boom control lever to fully retract boom. Hold
over relief. Pressure should be 2750–3000 psi (190–207 bar).
4 PSG E
Secondary
Function
Manifold
Steering Relief
2400–2600 psi
(165–179 bar)
With engine at FULL throttle, turn the steering wheel all the way
in one direction and hold while checking pressure. If pressure is
incorrect, adjust or replace the pressure-reducing cartridge.
5 PBG F
Secondary
Function
Manifold
Park Brake
minimum
400 psi (28 bar)
maximum
550 psi (38 bar)
With engine at idle, park brake released and no functions
operated, pressure should be 400 psi (28 bar) minimum. With
engine at idle, park brake released and steering held over relief,
pressure should be 550 psi (38 bar) maximum. If pressure is
incorrect, adjust or replace the pressure reducing valve in the
secondary function manifold. When adjusting the pressure
reducing valve, connect gauge to location 6. With engine at idle
and steering held over relief, adjust valve until gauge reads
500–550 psi (34–38 bar).
7 N/A
Brake Valve
(Manual
Brake
Pressure)
400 psi (28 bar)
minimum
With engine OFF, pump brake pedal twice. If pressure is
incorrect, check for external leaks. If no leaks are found, refer
to Section 8.7.5, “Brake Bleeding.”
7 N/A
Brake Valve
(Service
Brake
Pressure)
1000 psi
(69 bar)
minimum
With engine at idle, depress and hold brake pedal. DO NOT turn
the steering wheel. Check pressure. If pressure is incorrect,
refer to Section 8.7.5, “Brake Bleeding.”
8 C
Auxiliary
Hydraulics
3000 psi
(207 bar)
With engine at low idle, move auxiliary control lever left or right.
Hold auxiliary control lever over relief and check pressure. If
pressure is incorrect, check unloader pressure per location 2.
If location 2 is ok, check port reliefs on the aux section of main
control valve.