Checking The Gear Pump Pressure - Nilfisk-Advance SW8000 Service Manual

Service Manual – SW8000

Checking the Gear Pump Pressure

Note: There is
that can be used to check
Pump
the
Gear Pump
1. Connect the pressure gauge to the
the .
Gear Pump
2. Run the engine in the high throttle position
and allow the hydraulic oil to warm up.
3. Refer to the following tables to determine if
the gear pump and/or hydraulic motor is
operating correctly.
Note: All of the following readings were
static, taken on a smooth painted
concrete surface.
Machine Condition
High RPM, nothing running
High RPM, main broom only running, standard broom, two-inch wide brush pattern on
concrete, vacuum fan turned off
High RPM, main broom off, vacuum fan turned on, side brooms off
High RPM, main broom on, two-inch wide brush pattern on concrete, vacuum fan
turned on, side brooms off
High RPM, main broom on, two-inch wide brush pattern on concrete, vacuum fan
turned on, side brooms on
High RPM, raising empty hopper
Time to raise hopper – 10/11 seconds
High RPM, lowering empty hopper
Time to lower hopper – 7 seconds
High RPM, opening hopper door, nothing else running
High RPM, closing hopper door, nothing else running
Two side brooms running, nothing else running
One side broom running, nothing else running
Machine Condition
Two side brooms on the floor
One side broom on the floor
Main broom with a two-inch pattern
Vacuum fan impeller
on the
Test Port Gear
pressure.
on
Test Port
Gear
Pump
Measured Motor
Speed
103 RPM
130 RPM
405 RPM
8,920 RPM
Hydraulic System
Test
Port
Measured Pressure at
the Gear Pump Test
Port
380 psi
1,275 psi
1,650 psi
1,770 psi
1,810 psi
2,875 psi
380 psi
20 psi
50 psi
360 psi
425 psi
135