Kärcher HD 3.0/27 G User manual

9.801-760.0
SERVICE MANUAL
MODEL # ORDER #
HD 3.0/27 G 1.107-270.0
HD3.0/27 GB 1.107-271.0
HD 3.4/35 G 1.107-272.0
HD 3.3/35 GB
HD 4.0/40 G
HD 4.0/40 GB
HD 4.0/40 Ge
HD 4.0/40 GeB
1.107-273.0
1.107-274.0
1.107-275.0
1.107-276.0
1.107-277.0

9.801-760.0 • Rev. 03/16
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PRESSURE WASHER
SERVICE MANUAL
39
3
9
9
4
11
6
1
9
62
8
7
29
17
5
38
19
20
18
28
25
30
43
44
54
56
42
56 57
55
10
32
35
23
60
23
46
45
50
47
49
16
15
15
14
52
53
59
2
13
12
48
48
51
21
61
20
41
10
24
22
34
31 37
27
26
33
36
58
EXPLODED VIEW
For Models: HD3.0/27 GB, HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB
For
Detail
See Pump
Assy

9.801-760.0 • Rev. 03/16
PRESSURE WASHER
SERVICE MANUAL
8
EXPLODED VIEW PARTS LIST
ITEM PART NO. DESCRIPTION QTY
1 8.924-117.0 Al Base Belt Drive CW 1
2 8.924-394.0 Al Handle CW 1
3 8.924-393.0 Al Bumper Flat End CW 1
4 8.924-089.0 Axle CW Base AL 23" Long (HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB) 1
8.631-285.0 Axle, Dia .625, Frame, 21" l (HD 3.0/27 GB) 1
5 8.924-072.0 AL Spacer Tube DD Frame CW (HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB) 1
8.924-121.0 Al Spacer Tube BD Frame CW (HD3.0/27 GB) 1
6 8.924-124.0 Al Spacer Tube BD Frame CW 1
7 8.711-898.0 Wheel & Tire Assy,4"Rteel Rim,Flat Pro 2
8 9.802-782.0 Collar, 5/8" Bore Shaft 3010 2
9 9.802-706.0 Bolt, 1/4"-20 x 1-3/4" Carriage Zinc 8
10 9.197-010.0 1/4-20" Nylon Insert Lock Nut with Flange 17
11 8.924-074.0 Camaro Silver Axle Holder DD CW 2
12 8.924-116.0 Foot Al DD Frame CW 1
13 9.802-064.0 Grommet, Rubber, Nozzle Holder 2
14 9.802-066.0 Pad Soft Rubber 2
15 9.802-817.0 Washer, 3/8" x 1" 4
16 9.196-041.0 Hex Head Bolt 3/8-16 x 1-3/4 2
17 9.197-003.0 3/8-16 Nylon Insert L/N zc 5um White ((HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB) 4
9.197-003.0 3/8-16 Nylon Insert L/N zc 5um White ((HD3.0/27 GB) 8
18 9.802-317.0 Engine, Honda, GX 200, 6.5 HP (HD 3.0/27 GB) 1
8.750-680.0 Engine, Honda GX270, 9HP (HD 3.3/35 GB) 1
8.750-580.0 Engine, Honda, GX390, 13hp (HD 4.0/40 GB) 1
8.750-579.0 Engine, Honda GX390,13hp e/s 18a (HD 4.0/40 GeB) 1
19 9.802-714.0 Bolt, 5/16" x 1-3/4", NC HH (HD 3.0/27 GB) 4
9.186-021.0 Hex Head Bolt 3/8-16 x 2'' (HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB) 4
20 9.802-806.0 Washer, 5/16" Flat, (HD3.0/27 GB) 8
9.802-817.0 Washer, 3/8" x 1" (HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB) 8
21 9.197-003.0 3/8-16 Ne Nylon Insert l/n zc 5um White (HD 3.0/27 GB) 8
9.197-003.0 3/8-16 Ne Nylon Insert l/n zc 5um White (HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB) 4
22 8.754-751.0 Pump, Leuco Lb3030r, 3.0@3000, 1650 rpm (HD 3.0/27 GB) 1
8.750-755.0 Pump, Leuco Lm3540R.3, 3.5@ 4000 1850RPM (HD 3.3/35 GB) 1
8.755-216.0 Pump, Leuco Lm3840r.3, 3.8@4000 1740 rpm (HD 4.0/40 GB) 1
23 9.802-720.0 Bolt, 3/8" x 1", NC hh 6
24 9.197-003.0 3/8-16 Ne Nylon Insert l/n zc 5um White 4
25 8.924-085.0 Under-Pump Slider 1
26 9.802-813.0 Washer, 5/16" Split Ring Lock, Zinc (HD 3.0/27 GB) 4
9.802-816.0 Washer, 7/16", Split Ring Lock, Zinc (HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB) 4
27 9.802-742.0 Bolt, 8mm x 20mm (HD 3.0/27 GB) 4
9.802-744.0 Bolt, 10mm x 20mm, HH Zinc (HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB) 4
28 8.755-199.0 Bolt,3/8 x 6" Carriage Zinc 1
29 8.924-086.0 Frame Front Slider 1
30 9.802-789.0 Nut, 3/8", Hex, nc 1
31 8.924-118.0 Al Back Beltguard Short BD CW 1
32 9.802-380.0 Pulley, BK 80 h (HD 3.0/27 GB) 1
8.715-592.0 Pulley, 2BK 80h (HD 3.3/35 GB) 1
8.715-591.0 Pulley, 2BK 70 h (HD 4.0/40 GB) 1
33 9.802-379.0 Pulley, BK 36 h (HD3.0/27 GB) 1
9.802-384.0 Pulley, 2BK 40h (HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GBe) 1
9.802-385.0 Pulley 2BK 34H-S (HD 4.0/40GB, HD 4.0/40 GBe

9.801-760.0 • Rev. 03/16
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PRESSURE WASHER
SERVICE MANUAL
ITEM PART NO. DESCRIPTION QTY
34 9.802-415.0 Belt, BX35 (HD 3.0/27 GB) 1
8.715-695.0 Belt, BX34 ( HD 4.0/40 GB) 2
8.715-697.0 Belt, BX36 (HD3.3/35 GB) 1
35 9.802-402.0 Bushing, H x 24mm (HD 3.3/35 GB, HD 4.0/40 GB, HD 3.0/27 GB) 1
36 9.803-897.0 Bushing, H X 3/4 (HD3.0/27 GB) 1
9.802-399.0 Bushing, H X 1 (HD 3.3/35 GB, HD 4.0/40 GB) 1
37 8.755-200.0 Nut,# 10 Spring ST BLK` 7
38 8.924-119.0 AL Front Beltguard Short BD CW (For All Belt Drive Models) 1
39 8.755-214.0 Screw,10-24X3/4 7
40 8.718-608.0 Bolt, 1/4-20 X 1-1/2", Carriage, Zinc (HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB) 1
41 8.924-358.0 Camaro Silver Small Bracket 1
42 9.802-705.0 Bolt, 1/4"-20 x 1" Carriage Zinc ( HD 4.0/40 GeB) 1
43 8.924-120.0 AL Battery Support CW (For All Belt Drive Models) 1
44 8.706-652.0 Battery Box, Small (HD 4.0/40 GeB) 1
45 8.750-247.0 Trigger Gun Model m407 (All Models) 1
46 8.783-039.0 Wand 30" Zinc Plated, Handle & Coupler (HD3.0/27 GB) 1
8.783-040.0 Wand 44" Zinc Plated, Handle & Coupler (HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB) 1
47 8.916-740.0 Hose 3/8"X50,1W,TS,SO-SW 1
48 9.802-166.0 Coupler, 3/8" Socket, Female, Brass 1
49 9.802-170.0 Coupler, 3/8" Plug, Female, Steel Zinc 1
50 9.802-169.0 Coupler, 3/8" Socket, Male, Brass 1
51 5.731-652.0 Filter with weight 1
52 6.388-216.0 Hose DN 5 3.2ft
53 9.802-216.0 Injector, Chem, Non Adj, 0.083 1
54 8.924-266.0 Bracket Battery Small (HD 4.0/40 GeB) 1
55 8.755-219.0 Battery, Sealed, D18S (HD 4.0/40 GeB) 1
56 9.802-706.0 Bolt, 1/4-20 X 1-3/4" Carriage Zinc (HD 3.0/27) 1
8.730-042.0 Bolt Carriage, 1/4-20 X 2-1/2" Zinc (HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB) 1
57 9.804-627.0 Nozzle, SACQMEG, 000375, Red (HD 3.3/35 GB, HD 3.0/27 GB) 1
8.712-345.0 Nozzle, SAQCMEG 0004, Red (HD 4.0/40 GB, HD 4.0/40 GeB) 1
9.804-624.0 Nozzle, SAQCMEG 150375, Yellow (HD 3.3/35 GB, HD 3.0/27 GB) 1
8.712-346.0 Nozzle, SAQCMEG 1504, Yellow (HD 4.0/40 GB, HD 4.0/40 GeB) 1
9.804-625.0 Nozzle, SAQCMEG, 250375, Green (HD 3.3/35 GB, HD 3.0/27 GB) 1
8.712-347.0 Nozzle, SAQCMEG 2504, Green (HD 4.0/40 GB, HD 4.0/40 GeB) 1
8.712-340.0 Nozzle, SAQCMEG 4003.5, White (HD3.0/27 GB, HD 3.3/35 GB) 1
8.712-348.0 Nozzle, SAQCMEG 4004, White (HD 4.0/40 GB, HD 4.0/40 GeB) 1
8.712-398.0 Nozzle Black, QCEM-6540 Mess. (CHEM) 1
9.804-626.0 Nozzle, SACQMEG, 400375, WHITE (HD 3.0/27 GB) 1
8.712-337.0 Nozzle, SAQCMEG 0003.5, Red (HD 3.3/35 GB) 1
8.712-338.0 Nozzle, SAQCMEG 1503.5, Yellow (HD 3.3/35 GB) 1
8.712-339.0 Nozzle, SAQCMEG, 2503.5, Green (HD 3.3/35 GB) 1
58 8.718-607.0 Bolt, 1/4-20 X 3/4", Carriage 9
59 9.802-807.0 Washer, 3/8", Flat Zinc 4
60 9.198-004.0 3/8 USS F/W Zinc 4
61 9.198-014.0 Washer 21/64 X 1" 4
62 9.802-073.0 Weatherstrip, 1/8" x 1/2" 12''
EXPLODED VIEW PARTS LIST

9.801-760.0 • Rev. 03/16
PRESSURE WASHER
SERVICE MANUAL
10
PUMP ASSEMBLY EXPLODED VIEW
PUMP ASSY EXPLODED VIEW PARTS LIST
ITEM PART NO. DESCRIPTION QTY
1 8.754-751.0 Pump, Leuco LB3030R,
3.0@3000, 1650 RPM
(HD 3.0/27 GB) 1
8.750-755.0 Pump, Leuco LM3540R.3
3.5@ 4000 1850RPM
(HD 3.3/35 GB) 1
8.755-216.0 Pump, Leuco LM3840R.3,
3.8@4000 1740 RPM
(HD 4.0/40 GB) 1
8.754-756.0 Pump, Leuco LP3035G,
3.0@3500, 3400 RPM
(HD 3.0/27 G) 1
8.754-758.0 Pump, Leuco LP3535G1,
3.5@3500, 3400RPM
(HD 3.4/35 G) 1
8.750-753.0 Pump, Leuco LS4040G.
3, 4@4000, 3400 RPM
(HD 4.0/40 G, HD 4.0/40 GE) 1
2 8.707-256.0 Pump protector,1/2" 1
(
HD 3.0/27G, HD3.4/35G, HD4.040G, HD4.0/40Ge)
8.707-254.0 Pump protector,3/8" 1
(
HD3.0/27 GB, HD3.3/35 GB, HD4.0/40GB, HD4.0/40GBe)
3 8.706-168.0 Elbow, 3/8" NPT-p/n-
tf3529x6 Steel
(All Models) 1
9
11
6
8
8
7
5
6
13
4
12
Position of Pump protector
on GB and GeB models
For G and Ge models
3
10
2
2
1
ITEM PART NO. DESCRIPTION QTY
4 8.750-299.0 Unloader, Vrt3, 8 GPM
@4500 psi
(All Models) 1
5 9.802-171.0 Coupler, 3/8" Clug, Male,
Steel/zinc
(All Models) 1
6 8.706-944.0 Hose Barb, 3/8' barb x 3/8'
ml pipe
(All Models) 2
7 8.706-860.0 Tee, 1/2" Street, Brass
(All Models) 1
8 9.802-146.0 Swivel, 1/2" mp x 3/4" ghf
w/Strainer (All Models) 1
9 8.706-917.0 Bushing, 1/2" x 3/8", Brass
p/n-5406 (All Models) 1
10 8.711-785.0 Hose, 3/8" Push on, per ft
(All Models) 18''
11 8.706-984.0 Adapter, 1/2" fptx 1/2" mpt,
Brass (HD 3.0/27 G,
HD 3.0/27GB,
HD, HD 3.4/35 G) 1
12 8.706-207.0 Elbow, 3/8", Street 90 deg,Steel
(
HD 3.0/27 G,HD 3.4/35 G, HD 4.0/40 G,
HD 4.0/40 Ge) 1
13 8.706-829.0 Elbow, 1/2" Street, Brass
(HD3.0/27G,HD 3.4/35G,
HD4.0/40G, HD4.0/40Ge) 1

9.801-760.0 • Rev. 03/16
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PRESSURE WASHER
SERVICE MANUAL
LB3030R PUMP EXPLODED VIEW
8.754-751.0 LB3030R
LB3030R PUMP PARTS LIST
13
6
8
1
2
3
9
10
11
12
13
14
15
21
20
18
17
16
12
14
15
22
23
24
25
26
27
28
29
30
31
32
33
34
31
29
35
27
26
36
37
38
39
40
42
41
43
44
45
46
26
47
22
19
5
7
4
48
TORQUE
SPECS
Item # Ft.-lbs
15 65
18 55
26 8
36 10
44 10
ITEM PART NO. DESCRIPTION QTY
1 8.754-841.0 Crankcase 1
2 8.754-846.0 O-ring Ø1.78 X 72.75 1
3* See Kits Below Plunger Oil Seal 3
4* See Kits Below O-ring Ø1.78 X 26.7 3
5* See Kits Below Washer, Pressure Ring
16 mm 3
6* See Kits Below U-Seal, 16 mm 3
7* See Kits Below Pressure Ring, 16 mm 3
8* 9.803-199.0 U-Seal, 16 mm 3
9 9.803-199.0 Washer, Copper G1/2 1
10 9.802-926.0 Plug, Brass G1/2 1
11 8.754-852.0 Manifold 1
12* 8.717-233.0 O-ring Ø1.78 X 15.6 6
13* See Kits Below Valve Assembly 6
14* 9.803-948.0 O-ring Ø1.78 X 18.77 6
15 9.803-949.0 Valve Plug 6
16 8.754-851.0 Plug, Brass G1/4 1
17 8.718-973.0 Washer, Copper G1/4 1
18 8.754-854.0 Bolt, Manifold M14 X 40 2
19 8.754-850.0 Washer, Lock 2
20 9.803-198.0 Washer, Copper G3/8 1
21 8.707-262.0 Plug, Brass G3/8 2
22* See Kits Below Valve Seat 6
23* See Kits Below Valve Plate 6
24* See Kits Below Valve Spring 6
25* See Kits Below Valve Cage 6
ITEM PART NO. DESCRIPTION QTY
26 9.802-939.0 Screw, M6 X 16 12
27 8.717-137.0 Bearing Cover 2
28 9.803-954.0 Bearing Seal 1
29 8.754-843.0 Seal Spacer, Crankshaft 2
30 9.802-914.0 Snap Ring, 25 mm 1
31 9.803-955.0 Bearing, Ball 2
32 8.754-829.0 Shaft, 24 mm 3030 1
8.754-830.0 Shaft, 24 mm 4025 1
33 9.803-167.0 Key, Crankshaft 1
34 8.754-219.0 Oil Dipstick 1
35 8.933-010.0 Seal, Crankshaft 1
36* 8.754-855.0 Bolt, Plunger 3
37* 8.754-092.0 Spacer, Copper 3
38* 8.754-848.0 Plunger, 16 mm 3
39* 9.803-962.0 Spacer, Copper 3
40 8.754-827.0 Plunger Rod 3
41 9.803-965.0 Connecting Rod Pin 3
42 9.803-966.0 Connecting Rod 3
43 9.803-218.0 Washer, 6 mm 6
44 8.933-020.0 Screw, Connecting Rod 6
45 8.754-847.0 O-ring Ø2.62 X 111.62 1
46 8.754-842.0 Cover, Crankcase 1
47 9.803-906.0 O-ring Ø1.78 X 14 1
48 9.803-202.0 Sight Glass, G3/4 1

9.801-760.0 • Rev. 03/16
PRESSURE WASHER
SERVICE MANUAL
12
REPAIR KIT NUMBER 8.754-856.0 8.754-857.0 8.754-858.0 8.754-859.0 9.803-937.0
KIT DESCRIPTION
Plunger Seals 16
mm Seal Packing 16 mm Plunger 16 mm Complete Valve
Plunger Oil
Seals
ITEM NUMBERS
INCLUDED 4, 6, 8 4, 5, 6, 7, 8 36, 37, 38, 39 12, 13, 14 3
NUMBER OF CYLINDERS
KIT WILL SERVICE 31163

9.801-760.0 • Rev. 03/16
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PRESSURE WASHER
SERVICE MANUAL
VRT3 UNLOADER EXPLODED VIEW AND PART S LIST
9
8
23
26
3
16
1
10
24
11
6
4
13
14
20
25
12
22
19
15
2
15
21
17
18
7
9
5
6
8.750-297.0, 8 GPM, 2320 PSI
8.750-298.0, 8 GPM, 3630 PSI
8.750-299.0, 8 GPM, 4500 PSI
ITEM PART NO. DESCRIPTION QTY
25 8.750-712.0 Outlet Fitting 1
18 8.750-713.0 Knob, Unloader 1
8.750-709.0 Repair Kit, VRT3, 2320/3630
PSI
8.750-710.0 Repair Kit, VRT3, 4500 PSI
(Kit Items: 1, 4, 8-12, 16, 21-22)
1. Remove lock nut (Item 19).
2. Remove adjustment knob (Item 18).
3. Loosen the two (2) nuts (Item 15), move them upward on stem (Item 8) until you see 4 or more threads below the nut.
4. Re-attach adjusting knob (Item 18).
5. Start machine. Open the trigger of the spray gun. Increase pressure by turning adjustment knob (Item 18) clockwise until
pressure is at the desired operating pressure.
6. Remove the adjustment knob (Item 18), tighten the lower nut (Item 15) tightly against the upper nut (Item 15). Reattach
adjustment knob (Item 18) and screw down until contact is made with the nuts (Items 15). Screw down lock nut (Item 19)
onto the stem (Item 8) until the threads cut into the nylon insert of the lock nut (Item 19).
*If adjustment knob (Item 18) DOES NOT make contact with upper nut (Items 15), remove adjusting knob (Item 18), re-adjust
(raise) nuts (Items 15) on stem (Item 8) and re-attach adjustment knob (Item 18), then repeat step #6.
**If adjustment knob (Item 18) DOES make contact with upper nut; release the trigger of the spray gun and watch the pressure
gauge for the pressure increase (“spike”). This “spike” SHOULD NOT exceed 500 psi above the operating pressure. If “spike” pres-
sure exceeds the 500 psi limit, remove the adjusting knob (Item 18) and re-adjust (lower) the nuts (Items 15) on the stem (Item 8).
Re-attach the adjusting knob (Item 18), then repeat step #6.
Unloader Adjustment Procedures

9.801-760.0 • Rev. 03/16
25
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
For Models: HD3.0/27 GB, HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB
PROBLEM POSSIBLE CAUSE SOLUTION
LOW OPERATING
PRESSURE Faulty pressure gauge Install new gauge.
Insufficient water supply Use larger supply hose; clean filter at water
inlet.
Old, worn or incorrect spray nozzle Match nozzle number to machine and/or
replace with new nozzle.
Belt slippage Tighten or replace; use correct belt.
Plumbing or hose leak Check plumbing system for leaks. Re-tape
leaks with teflon tape.
Faulty or mis-adjusted unloader
valve
Adjust unloader for proper pressure. Install
repair kit when needed.
Worn packing in pump Install new packing kit.
Fouled or dirty inlet or discharge
valves in pump Clean inlet and discharge valves.
Worn inlet or discharge valves Replace with valve kit.
Obstruction in spray nozzle Remove obstruction.
Leaking pressure control valve Rebuild or replace as needed.
Slow engine RPM Set engine speed at proper specifications.
Pump sucking air Check water supply and possibility of air
seepage.
Valves sticking Check and clean or replace if necessary.
Unloader valve seat faulty Check and replace if necessary.
FLUCTUATING
PRESSURE
Worn or dirty pump valves Call local distributor.
Nozzle is obstructed Blow out or remove debris with fine needle.
Pump sucking air, inlet hose
leaking
Check that all hoses and fittings are airtight.
Turn off machine and trigger spray gun until
a steady flow of water emerges through the
nozzle.
Insufficient water supply Turn water on full force. Check garden hose
for kinks, leaks or blockage.
PRESSURE LOW
AFTER PERIOD OF
NORMAL USE
Nozzle worn Replace nozzle.
Unloader valve worn Replace unloader valve.
ENGINE WILL NOT
START OR STOPS
WHILE OPERATING
Low oil shutdown Fill engine with oil.
Out of gas Fill fuel tank.
Water in gasoline Drain gas tank; fill with clean fuel.
ENGINE IS
OVERLOADED
Nozzle partially blocked Clean nozzle.
Excessive pressure from high
engine RPM
Adjust engine throttle to lower RPM.

9.801-760.0 • Rev. 03/16
PRESSURE WASHER
SERVICE MANUAL
26
TROUBLESHOOTING
For Models: HD3.0/27 GB, HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB
PROBLEM POSSIBLE CAUSE SOLUTION
WATER OR OIL
LEAKING FROM
BOTTOM OF PUMP
A small amount of leaking is
normal
If excessive leaking occurs, call local
distributor.
PRESENCE OF
WATER IN PUMP OIL
Water sprayed at machine Change oil. Direct spray away from ma-
chine.
High humidity in air Check and change oil twice as often.
Piston packing worn. Oil seal worn. Call local distributor.
ENGINE OPERATES
FOR 15 MINUTES
THEN STOPS
Not enough gas or engine oil Fill tank with gas. Check oil level.
Vapor lock developed by heat of day Keep gas tank full to avoid vapor locking.
Obstruction in fuel filter Clean or replace fuel filter.
ENGINE LACKS
POWER
Dirty air filter Replace air filter.
ENGINE FALTERS Choke is opened too soon Move choke to halfway position until engine
runs smoothly.
WATER DRIPPING
FROM UNDER PUMP
Piston packing worn Call local distributor.
O-Ring plunger retainer worn Call local distributor.
Cracked piston Call local distributor.
OIL DRIPPING
FROM UNDER PUMP
Oil seal worn or damaged Call local distributor.
WATER LEAKING
FROM PUMP
PROTECTOR
Spray gun closed with machine
running 5 minutes or longer
Open spray gun or turn off machine.
Excess water supply pressure Place a pressure regulator at end of 50'
garden hose.
NO DETERGENT Detergent suction tube not properly
connected to machine
Check connection.
Detergent is too thick Dilute detergent. For best results, use
manufacturers detergent.
Detergent filter valve is at lowest
setting
Set detergent filter valve to a higher setting.
Filter on detergent suction tube is
clogged
Run warm water through filter to remove
debris.
Damaged or clogged detergent suc-
tion tube
Remove obstruction or replace detergent
suction tube.
A high pressure nozzle is attached. Replace with black detergent nozzle.
Discharge nozzle is obstructed Blow out or remove debris with fine needle.
GARDEN HOSE
CONNECTION
LEAKS
Loose fittings Tighten fittings.
Missing/worn rubber washer Insert new washer.

9.801-760.0 • Rev. 03/16
27
PRESSURE WASHER
SERVICE MANUAL
PREVENTATIVE MAINTENANCE
HD3.0/27 GB, HD 3.5/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB
This pressure washer was produced with the best available materials and quality craftsmanship. However, you
as the owner have certain responsibilities for the correct care of the equipment. Attention to regular preventa-
tive maintenance procedures will assist in preserving the performance of your equipment. Contact your dealer
for maintenance. Regular preventative maintenance will add many hours to the life of your pressure washer.
Perform maintenance more often under severe conditions. Check pump oil and engine oil level before first use
of your new pressure washer.
TROUBLESHOOTING
For Models: HD3.0/27 GB, HD 3.3/35 GB, HD 4.0/40 GB, HD 4.0/40 GeB
PROBLEM POSSIBLE CAUSE SOLUTION
SPRAY WAND
LEAKS
Spray wand not properly attached Slide the spray wand into the gun. Turn the
wand collar clockwise onto the spray gun
threads until tight.
Broken o-ring Call local distributor and order an o-ring.
PUMP IS NOISY Pump is sucking air Check that hoses and fittings are air tight.
Turn off machine and purge pump by
squeezing trigger gun until a steady flow of
water emerges through nozzle.
MAINTENANCE SCHEDULE
Engine Oil
Inspect Daily
Change First month or 20 hours.
Every 100 hours or every 6 months after first month
Filter Every 50 hours
Air Cleaner/Filter Inspect Daily
Clean Every 3 months or 50 hours
Engine Fuel Filter 500 hours or 6 months
Spark Plug
Maintenance
Inspect Every 6 months or 100 hours
Change Every year or 300 hours
Clean Fuel Tank(s) Annually
Pump Oil Inspect Oil level daily
Change After first 50 hours, then every 500 hours or annually (or 3 months)
Replace High Pressure Nozzle Every 6 months
Replace Quick Connects Annually
Clean Water Screen/Filter Weekly
Replace HP Hose Annually (if there are any signs of wear)
Belts* Tighten Every 6 months
Inspect/Replace Every 6 months
*Note: When servicing belts, don't exceed 14 lb-ft on pump mounting screws.Failure to do so will cause
pump thread damage.

KNA, Inc.4555 Airport Way Denver, CO 80239
Form #9.801-760.0 • Rev. 03/16 Printed in U.S.A. or Mexico