SkyTrak 6036 Service Manual - Manual (Page 161)

8-9 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
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 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.
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 engine at FULL
throttle, use 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 steering wheel all 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, 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.
7 PBG D
Secondary
Function
Manifold
500–600 psi
(34–41 bar)
With engine at idle, park brake released and steering held
over relief while checking pressure. If pressure is incorrect,
adjust or replace the pressure reducing valve in the
secondary function manifold.
8 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.”
8 N/A
Brake Valve
(Service
Brake
Pressure)
1000 psi
(69 bar)
minimum
With engine at idle, depress and hold brake pedal. DO NOT
turn steering wheel. Check pressure. If pressure is incorrect,
refer to Section 8.7.5, “Brake Bleeding.”
9 G1 E
Stabilizer
Cylinder
75–150 psi
(5,2–10,3 bar)
With engine at idle, check the pressure on the cylinder.