SkyTrak 8042 Service Manual - Manual (Page 430)

8.15 Model 8042, 10042, 10054 Legacy Rev. 10/03
Hydraulic System
Engine Information
Idle . . . . . . . . . . . . . . . . . . . . . 1,050 ±50 rpm
Full Speed. . . . . . . . . . . . . . . 2,750 ±100 rpm
Hydraulic Oil Information
Oil Type - 10W, meet ISO Grade 46
Capacity - Reservoir . . . . . 32.2 gal. (127 liter)
Capacity - System. . . . . . . . 64 gal. (242 liter)
Note: To adjust relief settings, pressure reducing
settings or standby pressure, turn the
adjustment screw clockwise to increase
pressure or counterclockwise to decrease
pressure.
The hydraulic oil temperature for the pump flow
test should be between 100-120° F (38-49° C)
(tank hot to the touch) during testing.
Equipment Needed to Perform Tests
from Hydraulic Diagnostic Test Kit
Test Location Gauge Fittings
4,000 psi gauge
(280 bar gauge) Unit equipped with fittings from
factory.
1,000 psi gauge
(70 bar gauge)
Unit equipped with fittings from
factory.
4,000 psi gauge
(280 bar gauge) Requires a male or female quick
disconnect coupler
TEST
LOCATION
Hydraulic Pump Flow Test
To check flow readings, a flow meter capable of measuring 60 gpm (3,8 liter/sec) and a load valve capable of
6,000 psi (413,4 bar) will be required (not included with Hydraulic Diagnostic Test Kit).
2,000 psi (137,8 bar) load @ Engine Speed of 2,500 ±25 rpm — Flow rate should be 48.9 GPM (3 liter/sec).
TEST
LOCATION
ADJUST.
LOCATION
COMPONENT
DESCRIPTION
PRESSURE
READINGS
PRESSURE TEST PROCEDURES
Pump Standby
Pressure 550-600 psi
(38-41 bar)
Loosen load sense line at location to bleed off pressure, and
then retighten line. With engine at idle and no hydraulic functions
operated, check pump standby pressure. If pressure is incorrect,
adjust top screw on compensator.
N/A
Pump Pressure
Compensator 3,300 psi
(228 bar) With engine at idle, turn steering wheel all the way in one direction.
Hold over relief and check maximum pump pressure. If pressure is
incorrect, consult factory.
Main Control Valve System Relief
3,000 ±100 psi
(207 ±7 bar)
With engine at FULL throttle, use the boom control lever to fully
retract the boom. Hold over relief and check pressure. If pressure is
incorrect, adjust or replace cartridge.
N/A
Attachment Tilt Relief/
FORWARD or
REARWARD 3,000 ±100 psi
(207 ±7 bar)
CONSULT FACTORY
N/A
Secondary Function
Manifold Load Sense
0-3,000 psi
(0-207 bar)
With engine at idle, load sense is 0 psi.
With engine at idle, use the boom control lever to fully retract the
boom. Hold over relief. Pressure should be 3000 psi (207 bar).
Secondary Function
Manifold Steering Relief
2,500 ±100 psi
(172 ±7 bar)
With engine at idle, turn the steering wheel all the way in one
direction. Hold over relief and check pressure. If pressure is
incorrect, adjust or replace the pressure reducing cartridge.
N/A
Secondary Function
Manifold Park Brake Release
550 ±50 psi
(38 ±3,4 bar)
With engine at idle and no hydraulic functions operated, disengage the
park brake and check pressure. This is not an adjustment.
Secondary Function
Manifold Park Brake Pressure
550 ±50 psi
(38 ±3,4 bar)
With engine at idle and park brake released, turn the steering wheel all
the way in one direction. Hold over relief and check pressure. If
pressure is incorrect, adjust or replace the pressure reducing cartridge
in the secondary function manifold.
N/A
Brake Valve
(Manual Brake
Pressure) 400 psi minimum
(28 bar)
With engine OFF, pump brake pedal twice. DO NOT overstroke the
brake pedal. If pressure is incorrect, check for external leaks. If no
leaks are found, refer to service manual brake system information.
N/A
Brake Valve
(Service Brake
Pressure) 550 psi minimum
(38 bar)
With engine at idle, depress and hold brake pedal. DO NOT turn
steering wheel. DO NOT overstroke the brake pedal. Check
pressure. If pressure is incorrect, consult service manual.
Auxiliary Hydraulics 3,000 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 main relief per
.
N/A
Stabilizer Cylinder 75-150 psi
(5,2-10,3 bar)
With the engine at idle, check the pressure on the cylinder.
3 4 5 2
7 8 10 6
9
CAUTION: GAUGE DAMAGE may occur. Malfunctioning hydraulic system circuits
may have excessive pressure and can cause hydraulic pressure spikes. Test circuit
with the highest reading pressure gauge first. If this gauge cannot record an
accurate pressure reading, use the next lower pressure gauge.
1
2 2a
2b
2
3 3a
3
4
5 4
6
7 5
8
8
9 3b
3
10