SkyTrak 8042 Service Manual - Manual (Page 155)

8-11 6036, 6042, 8042, 10042, 10054
Hydraulic System
Test
Location
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 34-40 GPM
(2,1-2,5 liter/sec)
Test
Location
Valve
Port
Adjust.
Location
Component
Description Pressure
Reading
Pressure Test Procedures
2 VG A Unloader
Valve
Main System
Relief 2900-
3100 psi
(200-214 bar)
With engine at high 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 A Auxiliary
Hydraulics
2900-3100 psi
(200-214 bar)
With engine at high 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 the main control valve.
2 VG N/A Attachment
Tilt Relief/
FORWARD or
REARWARD
2900-3100 psi
(200-214 bar)
CONSULT FACTORY
3 VG B Unloader
Valve
Standby
Pressure
250-300 psi
(17-21 bar)
Note: DO NOT touch any functions while the
pressure gauge is connected. You will damage
the pressure gauge.
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.
4 LSG N/A Unloader
Valve
Load Sense
0-3000 psi
(0-207 bar)
With engine at idle, load sense is 0 psi.
With the engine at FULL throttle, use the boom
control lever to fully retract the boom. Hold over
relief. Pressure should be 2750-3000 psi
(190-207 bar).
5 PSG C 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.
6 PBG N/A Secondary
Function
Manifold
Park Brake
minimum
400 psi (28 bar)
maximum
500-600 psi
(34-41 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 500-600 psi (34-41 bar)
maximum. After releasing steering wheel, the
pressure MUST NOT drop more than 50 psi in
one minute. If pressure drop is incorrect, refer to
Section 8.7.3, “Service Brake Valve.”
If pressure is incorrect, adjust per test 7.