SkyTrak 8042 Service Manual - Manual (Page 158)

Hydraulic System
8-14 6036, 6042, 8042, 10042, 10054
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 48.9 GPM
(3 liter/sec)
Test
Location
Adjustment
Location
Component
Description Pressure
Reading
Pressure Test Procedures
2 A Pump Standby
Pressure
550-600 psi
(38-41 bar)
Loosen load sense line at location B 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.
2 N/A Pump Pressure
Compensator
3300 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.
3 C Main Control
Valve
System Relief
2900-3100 psi
(200-214 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 and
replace cartridge.
3 N/A Attachment Tilt
Relief/
FORWARD or
REARWARD
2900-3100 psi
(200-214 bar)
CONSULT FACTORY
4 N/A Secondary
Function
Manifold
Load Sense
0-3000 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 and check pressure. Pressure
should be 3000 psi (207 bar).
5 E Secondary
Function
Manifold
Steering Relief
2400-2600 psi
(165-179 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.
6 N/A Secondary
Function
Manifold
Park Brake
Release
500-600 psi
(34-41 bar)
With engine at idle and no hydraulic functions
operated, disengage the park brake, check pressure.
This is not an adjustment.
7 F Secondary
Function
Manifold
Park Brake
Pressure
500-600 psi
(34-41 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.
8 N/A Brake Valve
(Manual Brake
Pressure)
minimum
400 psi
(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 Section 8.7.4, “Brake Test.”