Fisher Hopper - Hydraulic System Maintenance; Hydraulic Unit Troubleshooting

MAINTENANCE
Flush and refill reservoir annually, or sooner if
fluid shows signs of break-down or
contamination.
The use of proper hydraulic fluid in the system is
critical to satisfactory performance. Only clean,
new hydraulic fluid, of the proper viscosity,
should be used. Keep all hydraulic fluids in
original containers. Use only clean measuring
containers and funnels when pouring fluids, Keep
all containter closed when not in use.
Hydraulic Hopper Spreaders
I. Check hydraulic fluid level before every use.
Add fluid as required.
2. Periodically inspect the hoses and fittings for
danlage and possible leaks.
3. Change the hydraulic fluid filter after the first
50 hours of operation of a new unit.
4. Reservoir should be drained through the drain
plug only, NOT through the suction outlet.
TROUBLE SHOOTING for HYDRAULIC UNITS
iPROBLEM
CORRECTION
I, Unit speed does not increase with the dial setting
A. Increase truck engine speed.
B. Check condition of pump
C. Check for adequate PTO percent.
2.
Unit stalls under load
Check circuit pressure. 900-1, 200 PSI maximum with
relief valve dumping at 1,500 PSI.
3. Unit speed fluctuates momentarily when control is
fIrst turned on.
A. Cold oil. Wait until oil has warmed up.
B. Change to lighter weight oil.
4.
Pump blows seals at start-up.
Pump installed backwards. Replace seals and reverse pump
in drive line. (Note arrow on pump.)
ABBREVIA TION KEY
AR
ASSY
CB
CHMSL
CNP
CS
DIA
ELEC
EX
FL
G
HC
HP
HSG
HX
ill
LO
LK
MS
MS
NPTF
NYIS
PH
PN
PT
RC
SAE
SBH
SDTS
SFLS
SO
SP
SQ
SS
sm
STS
T
TFTS
TV
ZVC
ZP
As Required
Assembly
Carriage Bolt
Center High-Mounted Stoplight
Cooe Point
Cap Screw
Diameter
Electric
Extemal
Flat
Grade
High Capacity
Horsepower
Housing
Self-Drilling Tap Screw
Serrated Flange Lock Screw
Socket Head
Spring
Square
Set Screw
Standard
Stainless Steel
Tootb/feeth
Thread Forming Tapping Screw
Type
Zinc Yellow Chromate
Zinc Plated
Hex (Head)
Inside Diameter
Long
Lock
Machine Screw (fastener descriptions)
Mild Steel (non-fastener descriptions)
National Pipe Thread (Fluid)
Nylon Insert
Cross Recessed (Phillips Head)
Pan
Prevailing Torque
Regular Capacity
Society of Automotive Engineers
Socket Button Head
Form No.80357
12
April 2, 1998