Sierra Products EasyFire MODEL EFI 4000 - Manual (Page 26)

5061 Brooks St. Montclair, CA 91763
800-527-4790 Fax 1-909-399-3357
www.sierraproductsinc.com
P/N EF3801 4001 Sensor replacment 4/04
26
EF3801/4001 V1 Feed System
Service or Repair Instruction
Figure 1
Figure 3
OVERVIEW
The EasyFire feed system consists of four m ain com ponents, feed
m otor and m ounting plate, feed auger shaft, feed disk, and feed disk
bushing (Figure 1). These com ponents are designed to provide
thousands of hours of service and rarely require service or
replacem ent. Operation of feed system is controlled by the m ain
control board based on the stoves tem perature and heat setting. Unlike
other pellet stoves, the system operates by increasing and decreasing
the speed of the auger and disk. Pellets are pushed forward toward the
disk and as the disk rotates clockwise (from front of stove) allows the
pellets to be feed into the shoot. Three feed disk sizes are available
with the standard = 1, m edium = 2, and large = 3. #3 feed disks are for
large or long pellets only. If overfeeding or under-feeding is a problem
and adjusting the feed trim will not com pensate, changing the feed disk
is advised.
Rem oving and Replacing the Feed Assem bly: The feed assem bly
and gear m otor is accessed by rem oving the rear inspection panel for
both the heater and insert. Rem ove the four or six #8 screws
attaching the inspection cover and rem ove cover. Rem ove all pellets
from hopper and feed disk area inside unit. Locate feed m otor and
unplug wire harness connections (note location of red banded wire on
m otor to assure proper rotation of m otor). Rem ove wing nuts (or #10
nuts on som e units) attaching feed m otor bracket to rear of feed shoot.
Gently rem ove feed assem bly by pulling toward the rear of unit. The
feed shaft m aybe rem oved by loosening the allen screws holding the
shaft coupler. Rem ove the two #8 phillips screws holding the feed
m otor bracket to the gear m otor. Reverse process to install feed
m otor assem bly.
Bushing replacem ent: Disk bushing m ay be replaced by rem oving 2-
#8 retaining screws and carefully prying with a large flat blade screw
driver from inside hopper (Figure 2). To re-install bushing clean area
with thinner or alcohol and apply a sm all am ount of red lock-tight to bushing. Align with plate and carefully pry back with
screw driver. Straighten bushing and install retaining screws.
Shaft or Disk Replacem ent: The feed disk and shaft depth are set
at the factory to allow the feed disk to ride fully in the feed disk
bushing. W hen replacing either com ponent, m ake sure the installed
disk ride toward the rear of the disk (Figure 3) and does not extend
to far forward. If the disk is set to far forward it m ay jam b causing
the shaft to bend or break. Assem ble the new com ponents onto the
m otor drive loosely then install into stove. Carefully position disk and
m ark or tighten disk onto shaft. Rem ove disk and m otor assem bly
from stove and tighten with 1/8" allen wrench.
NOTE: W HEN ASSEMBLING THE SHAFT AND COUPLER,
ALW AYS USE A SMALL AMOUNT OF LOCK TIGHT (RED) ON
ALLEN SET SCREW S. AFTER THE ASSEMBLY HAS BEEN
INSTALLED THE FEED DISK MUST RIDE IN THE CENTER OF
THE FEED BUSHING.