SANDPIPER SB1 1/2-H - Manual (Page 3)

520-029-000 8/99 Model SB1½-H Page 3
Band clamps. Tighten the flange bolts securely after tightening the V-Band clamp.
IMPORTANT: Do not tighten the V-Band clamp without loosening the manifold flange
bolts at the outer chamber ports. The chamber flange may be broken.
HYDRAULIC DISTRIBUTION VALVE
The spool is closely sized to the sleeve, but should slide freely. Accumulation of
dirt and silting can prevent the spool from moving freely or stick in a position that will
prevent the pump from cycling. Remove the hydraulic valve body from the adapter
block, remove the end caps, and push out the spool. Wash the spool in cleaning
solvent or lubricant. Coat the spool with a light oil and reassemble making sure the
spool slides freely in the valve body.
PILOT VALVE
This assembly is reached by removing the adapter end cap and adapter block.
The pilot valve body assembly is then free to be lifted out of the intermediate housing
and inspected. The pilot valve spool can be pushed out of the sleeve exposing the o-
rings.
To inspect the sleeve, remove the retaining ring and slide the sleeve out of the
pilot valve body. The o-rings on the spool and sleeve should be replaced if worn and
lubricated with an o-ring lubricant before re-assembly.
When reinserting an externally serviceable pilot valve, push both plungers out of
the path of the pilot valve so that they and the pilot valve are not damaged.
PILOT VALVE ACTUATOR
The bushings for the pilot valve actuators thread into the intermediate bracket
from the outside. The plunger may be removed for inspection or replacement from
the inside by removing the adapter end cap, adapter block and the pilot valve body
assembly from the pump. The plungers should be visible as you look down into the
intermediate from the top. Depending on their position. you may find it necessary to
use a fine piece of wire to pull them out.
Under rare circumstances, it may become necessary to replace the o-ring seal. If
it cannot be removed in much the same manner as the plunger, the bushing can be
turned out through the inner chamber by removing the manifold assembly and the
outer chamber to reach the bushing.
TROUBLE SHOOTING
PROBLEM: Pump cycles but will not pump. (Note: higher suction lifts require faster
cycling speed for priming.)
POSSIBLE CAUSES:
A. Air leak in the suction line.
B. Excessive suction lift.
C. Check valve not seating properly.
D. Leakage at joint of suction manifold or elbow flange.
E. Suction line or strainer plugged.
F. Diaphragm ruptured.
PROBLEM: Pump will not cycle.
POSSIBLE CAUSES:
A. Discharge hose or line plugged, or discharge head requirement greater than
supply pressure. (Disconnect discharge line to check.)
B. Spool in distribution valve not shifting. (Remove end cap and check spool—must
slide freely.)
C. Diaphragm ruptured. (Hydraulic fluid will most often escape out discharge line in
this case.)
D. Blockage in diaphragm chamber preventing movement. (Shut off hydraulic supply
and reopen after pressure is relieved.)
PROBLEM: Uneven discharge flow. (Indicates one chamber not operating prop-
erly.)
POSSIBLE CAUSES:
A. Check valve not seating properly in one chamber.
B. Diaphragm failure in one chamber.
C. Air leak at suction manifold joint or elbow flange one side.
WARRANTY: This unit is guaranteed for a period of five years against defective
material and workmanship.
CAUTION
This pump is pressurized internally
during operation—always make certain
all bolting is in good condition and that
all correct bolting is reinstalled during
assembly.
CAUTION
Always disconnect hydraulic supply to
relieve pressure before disassembling
any portion of pump.
©1999 Warren Rupp, Inc. All rights reserved.
®SandPIPER and Tranquilizer are registered
tradenames of Warren Rupp, Inc.
®Neverseize is a registered tradename of
Loctite
Printed in U.S.A.
IMPORTANT
Do not tighten the V-Band clamp
without loosening the manifold flange
bolts at the outer chamber ports. The
chamber flange may be broken.