Operating Manual Maintenance
4/1/99
39
Proportioning Pumps
WARNING:
T
HE HYDRAULIC COMPONENTS ARE PRESSURIZED UP TO
3500
PSI
. B
EFORE
OPENING ANY HYDRAULIC CONNECTIONS OR SERVICING HYDRAULIC COMPONENTS
,
USE
EXTREME CAUTUION TO INSURE THAT ALL PRESSURES HAVE BEEN BLED TO ZERO TO AVOID
SERIOUS BODILY INJURY
.
Disassemble and clean both proportioning pumps annually. Inspect the pistons and
cylinder for mars or scratches, which may cause leakage or damage to packings. Gusmer
also recommends replacing the piston and cylinder packings, expanders, and packing
springs on an annual basis as a preventative maintenance precaution.
(Refer to the
Proportioning Pump Assembly section of the Parts I.D. for reference.)
WARNING:
T
O AVOID SERIOUS BODILY INJURY
. B
OTH PROPORTIONING PUMPS OPERATE
UNDER HIGH PRESSURE
. I
T IS IMPERATIVE THAT THE PUMP TIE RODS BE PRECISELY TORQUED
AFTER SERVICING
: H-2000 T
ORQUE TO
17
FT
.
LBS
. H-3500 T
ORQUE TO
30
FT
.
LBS
.
Pump Bases
WARNING:
B
OTH PUMP BASES OPERATE UNDER HIGH PRESSURE
. T
O AVOID SERIOUS
BODILY INJURY
,
BEFORE SERVICING THE PUMP BASE ASSEMBLY
,
USE EXTREME CAUTION TO
INSURE ALL PRESSURE FROM BOTH THE SUPPLY AND DELIVERY SIDE OF THE PUMP BASE HAVE
BEEN BLED TO ZERO
.
Disassembled and clean both Pump Bases annually. To do so follow these steps:
(Refer to the Pump Base Assembly section of the Parts I.D. for reference.)
1.
De-pressurize the system.
2.
Remove the valve cover bracket and the ball guides. A groove in the ball guide will
facilitate removal by use of a screwdriver. If the ball guide is particularly difficult to
remove, use a wrench to turn the guide back and forth while applying upward
leverage with a screwdriver.
3.
Check the chamfer around the cavity to insure that there are no sharp edges, which
could damage the o-ring and prevent proper seal. Inspect the ball guide o-ring and
replace as required. It is a good practice to liberally coat the o-ring with grease prior
to inserting the ball guide back into the pump base cavity.
To Next Page
