Vibration System and Steering
RD 12 / RD 12A
wc_tx000668gb.fm
58
6.2
Troubleshooting a System that Vibrates Poorly
Prerequisites
3000-psi pressure gauge
Compactible surface such as a bed of gravel or old tires
Background
The exciter pump is designed to put out a constant flow of oil at a set engine speed.
This ensures that the vibration frequency remains steady. When troubleshooting
the exciter circuit, the vibration speed, operating pressure, and relief pressures
must be known to help determine the cause of any problems.
Procedure
To measure vibration speed:
1. Start the machine and run it for several minutes to bring the hydraulic fluid up to
normal operating temperature.
2. Drive the machine onto a compactible surface such as a bed of gravel or old
tires.
3. Run the machine at full throttle. Check the engine RPM using a tachometer or
vibrotach. The engine must be running at the correct RPM to accurately mea-
sure vibration.
4. Start vibration. Hold the vibrotach (P/N 53397) against the outer rim of the drum
and measure the vibration speed.
5. Shut down the machine.
To check vibration system operating pressure:
1. Open the engine compartment.
2. Locate the exciter solenoid valve
(a)
.
3. Connect a 3000-psi gauge to the test port
(b)
.
4. Start the engine and run the machine at full throttle.
This procedure continues on the next page.
Engine RPM
Vibration Frequency
VPM
3100
4200
Summary of Contents for RD 12A
Page 1: ...5000192242 02 0912 5 0 0 0 1 9 2 2 4 2 Repair Manual Roller RD 12 EN...
Page 15: ...RD 12 RD 12A Safety Information wc_si000302gb fm 15 1 4 Label Locations X FF...
Page 21: ...RD 12 RD 12A Safety Information wc_si000302gb fm 21 Notes...
Page 25: ...RD 12 RD 12A Operation wc_tx000865gb fm 25 53 47 54 61 50 62 55 wc_gr004114 56...
Page 29: ...RD 12 RD 12A Operation wc_tx000865gb fm 29 wc_gr002951 N F R 55 42 44 54 10 15...
Page 119: ...RD 12 RD 12A Disassembly Assembly wc_tx000671gb fm 119...
Page 120: ...Schematics RD 12 RD 12A wc_tx001073gb fm 120 10 Schematics 10 1 Hydraulic Schematic...
Page 122: ...Schematics RD 12 RD 12A wc_tx001073gb fm 122 10 4 Electrical Schematic A RD 12A...
Page 124: ...Schematics RD 12 RD 12A wc_tx001073gb fm 124 10 6 Electrical Schematic B RD 12A...
Page 126: ...Schematics RD 12 RD 12A wc_tx001073gb fm 126 10 8 Electrical Schematic RD 12...
Page 137: ......