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problem
pulsaTIon
loW
pressure
pump runs
exTremely rough,
pressure
very loW
WaTer leakage
from unDer
manIfolD.
oIl leakIng In area
of CrankshafT
exCessIve
play In enD of
CrankshafT
pulley
WaTer In
CrankCase
oIl leakIng from
unDersIDe of
CrankCase
oIl leakIng aT
rear porTIon
of CrankCase
louD knoCkIng
noIse In pump
14
All manuals and user guides at all-guides.com
TroubleshooTIng
possIble Cause
Faulty pulsation damper
Worn nozzle
Belt slippage
Air leak in inlet plumbing
Relief valve stuck, partially plugged or
improperly adjusted. Valve seat worn
Inlet suction strainer clogged or
improperly sized
Worn packing.
Abrasives in pumped in cavitation.
Inadequate water
Fouled or dirty inlet or discharge valves Clean inlet and discharge valve
Worn inlet, discharge valve blocked
or dirty
Leaky discharge hose
Restricted inlet or air entering the inlet
plumbing
Inlet restrictions and/or air leaks. Stuck
inlet or discharge valve
Worn packing
Worn crankshaft seal or improperly
installed oil seal O-ring
Bad bearing
Worn main bearing from excessive
tension on drive belt
Humid air condensing into water inside
crankcase
Worn packing and/or piston rod sleeve;
O-rings on plunger retainer worn
Worn crankcase piston rod seals
Worn crankcase piston rod seals
Pulley loose on crankshaft
Broken or worn bearing
LANDA VHP • 8.913-949.0 • Rev. 5/13
soluTIon
Check precharge. If low, recharge or install
new one.
Replace with nozzle of proper size.
Tighten or replace with correct belt.
Disassemble, reseal and reassemble.
Clean and adjust relief valve; check for
worn or dirty valve seats. Kit available.
Clean. Use adequate size. Check more
frequently.
Install proper filter. Suction at inlet mani-
fold must be limited to lifting less than 20
feet of water or 8.5 psi vacuum.
assemblies.
Replace worn valves, valve seats and/or
discharge hose.
Replace.
Proper size inlet plumbing; check for air
tight seal.
Replace worn cup or cups. Clean out
foreign material. Replace worn valves.
Install new packing.
Remove oil seal retainer and replace
damaged O-ring and/or seals.
Replace bearing.
Replace crankcase bearing and/or
tension drive belt.
Change oil intervals. Use any high grade
automotive 30 weight non-detergent oil.
Replace packing. Replace O-rings.
Replace seals.
Replace seals.
Check key and tighten set screw.
Replace bearing.
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