Valve, Unloader
p/n C07-04504M-A
Troubleshooting
Trouble Possible Cause Remedy
Frequent valve recycles
Damaged check valve O-ring Remove and replace
Leaking connections Check or renew
Restricted bypass or too small
Clean or adapt
passage diameter
Valve does not reach
pressure
Piston O-rings worn out Remove and replace
Debris between seat and
Clean the seat
Seat worn out Remove and replace
Nozzle worn out Remove and replace
Incorrect choice of nozzle Fit with smaller nozzle
High pressure peaks at
gun closure
There is not a minimum of 5%
of total flow
discharged in bypass
Reset Correctly
Excessive flow in bypass
Change type of valve
or adjust passages
Adjustment with spring totally
screw and eventually
fit with smaller nozzle
discharge
at low pressure at gun
Jammed check valve Jammed check valve
Debris on check valve Clean
Maintenance Procedures
Every 400 working hours, check and lubricate the seals with water resistant
grease with water resistant grease.
Pre-Cleaner Assembly
1
7
5
2
11
10
8
4
3
9
6
ASSEMBLY, PRE-CLEANER
8/28/2015
ITEM
NO.
PART NUMBER
PART DESCRIPTION
QTY.
1
5355-00130
WELDMENT, FRAME
1
2
53052V-10134
WELDMENT, MOUNT
1
3
5305A-00105
WELDMENT, CHASSIS - COIL
1
4
5305A-00401
ASSEMBLY, BURNER-OIL
1
5
F05-00529
ENGINE, GAS - 18HP,
Kohler
1
6
H04-31326
CAP, SCREW
4
7
H05-31300
WASHER, FLAT - 5/16
4
8
H06-31300
NUT, LOCK - 5/16"
8
9
H06-37500
NUT,LOCK-3/8-16UNC HEX
3
10
H06-50001
NUT, 1/2 - 20UNF
8
11
H10-50000
MOUNT, SHOCK
4