SkyTrak 6036 Service Manual - Manual (Page 227)

8.11 Model 6036 Legacy
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. (122 liter)
Capacity - System . . . . . . . . 57.5 gal. (218 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
Circuit Gauge Fittings
4,000 psi gauge
(276 bar) Unit equipped with fittings from factory.
1,000 psi gauge
(69 bar) Unit equipped with fittings from factory.
4,000 psi gauge
(276 bar) 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 28-32 GPM (1,8-2,0 liter/sec).
TEST
LOCATION
ADJUST.
LOCATION
COMPONENT
DESCRIPTION
PRESSURE
READINGS
PRESSURE TEST PROCEDURES
Unloader Valve Main System Relief
3000 ±100 psi
(207 ±7 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.
Unloader Valve LIft/Lower Relief
3000 ±100 psi
(207 ±7 bar)
Remove the carriage if attached. With 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.
N/A
Attachment Tilt
Relief/FORWARD or
REARWARD 3200 ±50 psi
(221 ±3,4 bar)
CONSULT FACTORY
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.
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 the boom control lever to fully retract
the boom. Hold over relief. Pressure should be 2750-3000 psi
(190-207 bar).
Secondary Function
Manifold Steering Relief
2500 ±100 psi
(172 ±7 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.
Secondary Function
Manifold Park Brake
400 psi (28 bar)
minimum
550 psi (38 bar)
maximum
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
. With engine at idle and steering
held over relief, adjust valve until gauge reads 500-550 psi (34-38 bar).
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 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
. If is ok,
check port reliefs on the aux section of main control valve (consult
factory).
2 4 3
5 6 7
8
1
2 2a
2 2b
2
2 3a
3
4 4a
5 5a
6
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8 2c 2 2